跟讀練習: The First Mass Extinction as Explained by Lindsay Nikole - 通過影片學習英語口語
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127 句
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1
Extinction is a fact of life on Earth.
滅絕是地球生命歷程中的一個客觀事實。
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Our planet is always changing, and not every species can handle the changes.
我們的星球始終在不斷變化，並非所有物種都能適應這些變化。
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So it's pretty normal for a handful of species to go extinct every year.
所以每年有少數幾個物種滅絕是很正常的。
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But sometimes, huge changes cause lots of extinction, and tons of species disappear in a relatively short time all over the world.
但有時，巨大的環境變化會引發大規模滅絕，大量物種會在相對較短的時間內從全球各地消失。
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A mess.
一團糟。
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Extinction.
滅絕。
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These events are terrifying and fascinating.
這些事件既令人恐懼，又引人入勝。
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By studying mass extinctions, we learn how our world got the way it is now, and where it's headed.
通過研究大滅絕事件，我們得以瞭解當今世界的形成過程，以及它未來的走向。
9
Right now, rates of extinction are so high that we might be on the verge of a modern mass extinction.
目前，物種滅絕的速度極高，我們可能正處於一場現代大滅絕的邊緣。
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Experts predict that if this trend continues, we could lose up to 50% of all species on Earth by 2050.
專家預測，如果這一趨勢持續下去，到2050年，地球上可能會有多達50%的物種消失。
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So, for this video series, I'm partnering with Colossal, the de-extinction company, working to prevent the next mass extinction.
所以，在這個系列影片中，我與致力於反滅絕的公司Colossal展開合作，共同努力防止下一次大滅絕的發生。
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Throughout Earth's history, there have been five famous mass extinction events, the Big Five.
在地球歷史上，曾發生過五次著名的大滅絕事件，即“五大滅絕事件”。
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In each one, more than 70% of life on Earth died out.
每一次大滅絕事件中，地球上都有超過70%的生物滅絕。
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In this series, we're going to explore the causes and effects of each of them, one by one, to lay out what we know about mass extinctions of the past so we can prevent another one.
在本系列中，我們將逐一探討每一次大滅絕的成因與影響，梳理我們已掌握的過往大滅絕事件的相關知識，從而避免另一場大滅絕的發生。
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First up is the oldest of the big five, the Ordovician mass extinction.
首先要介紹的是五次大滅絕中最古老的一次——奧陶紀大滅絕。
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The Ordovician period was from 485 to 444 million years ago.
奧陶紀的時間跨度為4.85億年前至4.44億年前。
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During this time, the Earth was like an alien world.
在這段時期，地球就像一個外星世界。
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There were no familiar shapes among the continents or oceans.
各大洲和大洋的輪廓都看不出熟悉的樣子。
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Most of the land masses were in the southern hemisphere, like the supercontinent Gondwana.
當時大部分陸塊都位於南半球，例如岡瓦納超大陸。
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The world was very warm and had very high sea levels, which created lots of warm, shallow ocean habitats.
當時全球氣候十分溫暖，海平面也非常高，形成了大量溫暖的淺海棲息地。
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Those warm oceans are where we find Ordovician life, like Eurypterid sea scorpions crawling along the ocean floor.
在那些溫暖的海洋中，我們能找到奧陶紀的生物，比如在海底爬行的板足鱟類海蠍。
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Some of them got to almost six feet long.
其中有些長到了將近六英尺。
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Squid-like cephalopods with massive shells drifted through the water.
長著巨大外殼的烏賊類頭足類動物在水中漂游。
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The biggest ones, like Endoceros, were almost 20 feet long.
最大的物種，比如內角犀，體長接近20英尺。
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I like those cones a lot.
我特別喜歡那些甜筒。
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There were ancient corals, sea lilies, sponges, lamp shells, et cetera.
那裡曾有古代珊瑚、海百合、海綿、腕足類動物等生物。
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This was also the time of the trilobites.
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Big ones, small ones, smikey, smikey, spiky and smooth, crawling and swimming and burrowing all over the ocean.
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There were also fish, too.
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They were strange, jawless species, including eel-like conodonts, and also ones like Sacobambaspis, a tiny jawless fish that had armored plates on their heads.
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Almost all life at this time lived in the water.
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The land was almost completely barren, except for some of the earliest land plants that were just starting to creep up.
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Fossil spores provide evidence that simple non-vascular plants, similar to like mosses and liverworts, forming green carpets over the rocks, very mid-century.
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At the end of the Ordovician, in the last two million years or so of the period, this alien world was rocked by a global mass extinction.
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In the fossil record, we see about 85% of species disappear.
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Trilobites, corals, fishes.
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Every group experienced major loss.
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This is the first time that animal life on Earth experienced a global collapse of this scale.
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That mean Noah.
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But a mass extinction doesn't happen for no reason.
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Rocks and fossils from the late Ordovician contained clues to the cause of this catastrophe.
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Specifically, changes in the chemical makeup of certain minerals reflect a massive climate fluctuation.
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First, the Earth got slapped with a global cooling, and then slapped with a global warming.
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A one-two punch of destruction.
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It starts with an event called the Hernantian Glaciation, the Ordovician Ice Age.
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Scientists have identified geologic evidence of ice sheets at the South Pole, kind of like the ice that covers Antarctica today.
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Also, a drop in sea level of about 300 feet, while that water was frozen into ice.
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Global temperatures dropped at least 5 degrees Celsius, disrupting the formation of certain minerals and leaving telltale evidence in rocks and fossils.
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All of this was bad for sea life.
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Colder temperatures were a big problem for any species that got very cozy in those warm waters.
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And also, as sea levels fell, the water drained away from coastlines and shallow seas.
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So, their habitats were done-zo anyway.
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Changes to sea level and water temperature also disrupt ocean chemistry and circulation, which can mess with animal migrations, reproduction, even down to the basic finding food and breathing properly.
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But an ice age doesn't happen for no reason either.
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The cause of the cooling was a change in the atmosphere.
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Minerals from the late Ordovician period show a change in their carbon composition, the kind of change that happens when atmosphere is running low on carbon dioxide.
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Carbon dioxide is a greenhouse gas, which means it traps heat in the atmosphere.
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Less CO2 in the air means less trapped heat, means cooler global climate.
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Exactly why CO2 levels plummeted in the late Ordovician is hard to say for sure, but there are two prime suspects that were suspiciously active at this time in Earth's history.
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Volcanoes and plants.
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Volcanoes are where baby rocks come from as lava cools, it forms new solid rock.
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And if that rock is exposed to the air, it can experience chemical weathering, which is a process that pulls CO2 out of the atmosphere.
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Lava rocks from the late Ordovician provide evidence that volcanoes were erupting at that time, producing lots of new rocks that were weathering away.
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But you know what else draws CO2 out of the air?
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Yeah, plants.
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Like I said before, land plants were just getting started in the Ordovician, just like we breathe in oxygen to fuel our bodies, plants breathing carbon dioxide to power their photosynthesis.
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As plants became more common on land, they pulled more and more carbon dioxide from the atmosphere.
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Land plants also churn up the ground, pulling up mineral nutrients that end up getting washed into the oceans.
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Similar nutrients can also be released from volcanic eruptions and from weathering rocks.
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As those nutrients concentrate in shallow waters, they can become fuel for massive blooms of algae, cyanobacteria, which also suck up carbon dioxide.
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So some combination of land plants, volcanoes, and algal blooms was pulling lots of carbon out of the Ordovician atmosphere.
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And once the cooling trend got started, it snowballed.
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As water freezes into ice, sea levels drop, which exposes more land to weathering, which draws down more CO2, which means more cooling.
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And on, and on, and on.
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Ice is also very reflective, so sunlight bounces off of it, taking some heat with it.
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In the late Ordovician, the giant continent Gondwana sat right over the South Pole, so there was lots of room for massive ice sheets.
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As the ice sheets grew, they reflected more and more heat, and the air got colder and on and on and on.
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Freezing water also acts as a trap for carbon dioxide.
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Rain pulls carbon dioxide down with it.
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When the water freezes the CO2 gets stuck in the ice.
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This is called a positive feedback loop, a series of events that reinforce themselves.
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But if you were to ask the Ordovician species they'd say it was very negative for them.
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Some species were pretty quick to adapt to the changing climate.
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Certainly the Ordovician fossil sites are full of cold adapted species that establish new ecosystems in these cooler conditions.
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But then the second slap.
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Right before the end of the Ordovician the Ice Age All those trends we see in the rocks and fossils become reversed, reflecting new trends of rising temperatures,
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rising sea levels, and rising carbon dioxide in the atmosphere.
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Ocean habitats got messed up again.
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Those cold-adapted ecosystems that had literally just settled were destroyed by warming temperatures.
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And once again, there were global changes to ocean chemistry and circulation, as well as the shape of shallow ocean habitats.
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Rising temperatures and CO2 in the ocean can also lead to ocean acidification a change in seawater chemistry
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that dissolves the shells and skeletons of species like corals and plankton, which form the foundation of ocean ecosystems.
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The rock record of the latest Ordovician also contains deposits of black shale, a type of rock that forms from sediment deposited in oxygen-poor water.
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Ocean circulation is responsible for carrying oxygen from the atmosphere down to deeper waters.
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When that circulation changes, certain waters can become deprived of oxygen.
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Also, when those massive blooms of algae die, they decompose, which is a chemical process that sucks up oxygen from the water.
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So, between changing circulation patterns and lots of decomposing microbes, oxygen levels were dropping all over the ocean, suffocating marine life and leaving behind those black shales.
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And just like ice ages don't start for no reason, they also don't end for no reason.
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In this case, the reason is most likely those volcanoes.
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I said before that volcanoes can lead to cooling, which is true, especially on short time scales, but volcanic gases also contain lots of carbon dioxide.
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So when When volcanic eruptions continue for a long time, they release tons of CO2 into the atmosphere.
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Then we get those runaway processes again, in reverse.
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More CO2 traps more heat, so the climate gets warmer.
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Warmer temperatures melt more ice, which reflects less heat, releases trapped carbon dioxide, leading to more warming.
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Melting ice also floods the seas, raising sea levels, flooding exposed to land, protecting the rocks from weathering, so less CO2 is being pulled out of the air, and so on, and so on, and so on.
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And before you know it, the ice age is over.
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The world is warm again, and ecosystems are in shams.
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By the time it's all done, about 443 million years ago, most of that alien ordovician biodiversity is gone.
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About 85% of species became extinct.
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Some of the hardest hit groups were temperature-sensitive species like corals, sponges, and plankton.
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And so many other species rely on these animals for food and shelter that with them gone, entire ecosystems collapsed.
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Some groups eventually recover pretty well.
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Sea lilies and fish go on to become highly diverse and successful again.
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Other groups never regain their former glory.
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Trilobites got hit pretty hard, and they're never again as widespread or varied as they were in the Ordovician.
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And some groups vanished completely, like those giant Endoceracephalopods.
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And in case you're wondering, land plants were fine.
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They were pretty much barely affected.
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They're probably responsible for this whole fiasco, but it's everyone else that suffered for it, as that's just the way it works.
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But life on Earth goes on.
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After the Ordovician comes the Silurian Period.
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Recovery starts off slow, but gradually, plants and animals develop all new ecosystems throughout the seas, and eventually on land too.
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And soon the world is once again home to an incredible diversity of life.
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Until the next Mass Extinction.
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This is the first episode of a six-part series on mass extinctions.
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Make sure to follow the Colossal YouTube channel for the next episode, where we're gonna go over the confusing mess of the Devonian Mass Extinction.
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See ya!
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真實場景：地球歷史與滅絕事件
這段影片通過講解奧陶紀大滅絕，展現了科學知識的表達場景。內容涉及地質時期、物種描述、氣候變化等，既適合積累學術詞彙，也能鍛鍊描述複雜現象的口語能力。對於備考雅思口語的同學，這種兼具資訊性與邏輯性的表達，是練習“自然科學類話題”的優質素材。
實用短語與搭配
- mass extinction：大滅絕（高頻學術詞彙，雅思口語中描述生態話題必備）
- global cooling/warming：全球變冷/變暖（氣候變化類表達，搭配“a one-two punch of destruction”（雙重打擊）更生動）
- fossil record：化石記錄（科學論證中常用，可用於“證據類”表達，如“從化石記錄中我們能看到……”）
- shallow ocean habitats：淺海棲息地（描述生態環境的精準搭配，替換“ocean”讓表達更具體）
- on the verge of：瀕臨（口語中描述危機的常用短語，如“我們可能瀕臨一場現代大滅絕”）
影子跟讀挑戰
現在就用“英語影子跟讀”法練習！選擇影片中“奧陶紀時期的地球環境”段落（從“Ordovician period was from... ”到“green carpets over the rocks”），播放一句暫停，立即跟讀，注意模仿語速和語調。重複3遍後，嘗試無暫停同步跟讀。這個方法能快速提升口語流暢度，是“shadowspeaks”訓練的核心技巧。堅持1周，你會發現雅思口語中的長句表達更自然。
記住：看YouTube學英語，不僅要學知識，更要練表達。用影子跟讀吃透每個段落，讓科學內容成為你的口語素材庫！
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | was rocked · was frozen · is exposed |
| 定語從句 who / which + 從句 — 補充說明人或事物 | circulation, which can · gas, which means · weathering, which is |
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | have been · have identified |
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。