跟讀練習: Why Are Leaves Green? - 通過影片學習英語口語

選擇練習模式

每種模式都會開啟全屏練習室。

66 句

如果句子過短或過長，請點選 Edit 進行調整。

Take a walk through almost any forest, park, or backyard, and one color dominates the landscape, green.

From towering oak trees to tiny blades of grass, leaves across the world seem to share this familiar shade.

But have you ever wondered why?

Why aren't most leaves blue, red, or even black?

Is green simply a coincidence or is there a deeper scientific reason behind it?

So why are leaves green?

As it turns out, the answer involves sunlight, chemistry, evolution and billions of years of life adapting to Earth.

The green color that we often take for granted is actually a remarkable clue about how plants survive

and how our planet functions.

Let's dive in, right here, on History of Simple Things.

The primary reason leaves are green is because they contain a pigment known as chlorophyll.

A pigment is a substance that absorbs certain colors of light while reflecting others.

Chlorophyll is found inside tiny structures called chloroplasts, which exist in the cells of plant leaves.

These chloroplasts act like miniature solar power stations, capturing energy from sunlight.

Chlorophyll is especially good at absorbing red and blue wavelengths of visible light, which carry plenty of energy for photosynthesis.

However, it absorbs much less green light.

Instead of using those green wavelengths, chlorophyll reflects and scatters them back into the environment.

When sunlight reaches our eyes after bouncing off a leaf, the green wavelengths are what we see, making the leaf appear green.

This isn't because plants create green light,

but because they leave that part of the visible spectrum largely untouched while absorbing the colors they need most.

The green color of leaves is closely tied to one of the most important biological processes on Earth, photosynthesis.

During photosynthesis, plants use sunlight to convert carbon dioxide from the air and water from the soil into glucose,

a type of sugar that serves as food.

Oxygen is released as a byproduct, making the atmosphere breathable for animals and humans.

chlorophyll plays the central role by capturing light energy and using it to drive a series of chemical reactions inside the chloroplast.

These reactions eventually produce the energy-rich molecules needed to build glucose.

Without chlorophyll, plants would struggle to capture enough sunlight to survive.

Since nearly every food chain begins with plants converting sunlight into usable energy.

Photosynthesis supports almost every living organism directly or indirectly.

The green color of leaves is therefore a visible sign that this life-sustaining process is constantly taking place around us.

If sunlight contains all the colors of the rainbow, why did plants evolve to reflect green instead of using every available wavelength?

Scientists have studied this question for decades, and the answer is more complex than it first appears.

Chlorophyll evolved billions of years ago under the lighting conditions of the young Earth.

The sun emits the greatest amount of energy in green wavelengths, but those wavelengths are not always the most efficient for driving photosynthesis.

Red and blue light provide energy that chlorophyll can use particularly effectively during the chemical reactions involved in producing sugars.

Green light also penetrates deeper into leaves, allowing lower layers of cells to use some of it through additional pigments and scattering effects.

Researchers continue to investigate why chlorophyll became Earth's dominant photosynthetic pigment,

but its remarkable efficiency has allowed green plants to thrive across countless environments for hundreds of millions of years.

Although green is the most common leaf color, it is not the only one.

In autumn, many trees turn yellow, orange, and red as shorter days and cooler temperatures cause chlorophyll to break down.

As the green pigment fades, carotenoids and anthocyanins become visible, creating warm and vivid colors.

Some tropical plants naturally display red, purple, or variegated leaves year-round,

yet they still contain chlorophyll beneath those pigments.

No matter their appearance, nearly all plants rely on chlorophyll to power photosynthesis.

From mosses on forest floors to rainforest trees, pond plants, and open field grasses,

chlorophyll is the main pigment that captures sunlight.

Some plants and algae also use accessory pigments to absorb extra wavelengths, especially in shade or underwater,

but chlorophyll remains the foundation.

This shared strategy has helped plants survive in many habitats for hundreds of millions of years,

showing that even when leaves do not look green,

chlorophyll is still one of the most important molecules supporting life on Earth in nearly every ecosystem on the planet today.

The green color of leaves affects far more than individual plants.

Through photosynthesis, forests, grasslands and other vegetation absorb carbon dioxide and release the oxygen that animals and humans need to survive.

Plants also help cool the environment through shade and transpiration, while providing the energy that supports nearly every food chain.

Scientists even use satellites to measure Earth's greenness to monitor forests, crops, droughts, and ecosystem health.

What appears to be an ordinary green leaf is actually a sign of one of nature's most important processes.

Every leaf plays a small but vital role in maintaining healthy ecosystems,

supporting biodiversity, regulating the climate, and helping keep Earth a planet where life can continue to thrive.

Leaves are green because of chlorophyll, the pigment that absorbs red and blue light while reflecting green.

This allows plants to perform photosynthesis, producing the food and oxygen that sustain nearly all life on Earth.

Although scientists continue to study why chlorophyll became nature's dominant pigment, Its importance is undeniable.

The next time you see a green leaf, remember that its color is more than just appearance.

It is a visible sign of one of nature's most essential processes, quietly powering the ecosystems that make life on our planet possible.

Thank you for watching.

If you have suggestions for our next video, feel free to share them in the comments below.

We'll be sure to give you an acknowledgement for your contribution.

下載應用

流利口語所需的一切

AI 發音評分逐句打分

音標練習掌握每個音

詞彙學習建立你的詞庫

詞彙遊戲邊玩邊學

掃碼

Download on theApp Store Get it onGoogle Play

同頻道

FOR YOU

你能學到什麼

通過這段影片，你將提升兩項關鍵英語口語技能：一是用自然節奏解釋科學現象的能力，比如清晰闡述“葉綠素如何吸收光線”這類複雜概念；二是在長句中保持語流連貫，像影片中那樣流暢連線“陽光-葉綠素-光合作用”等資訊點。這些技能能幫你在日常交流或演講中更自信地表達觀點。

注意這些發音現象

影片中存在不少實用的連讀和弱讀技巧，比如“turns out”連讀為/tɜːrnz aʊt/，“chloroplasts which”弱讀為/ˈklɔːrəplæsts wɪtʃ/。此外，“sugars that serves”中的“that”弱讀為/ðət/，讓整句話聽起來更自然。這些發音細節是“shadowspeak”練習的重點，能幫你擺脫“逐字朗讀”的生硬感。

像母語者一樣表達

要模仿影片 speaker 的節奏和重音，需注意以下兩點：一是關鍵詞重讀，比如“葉綠素”“光合作用”“能量”等科學術語要適當加重語氣；二是句間停頓，在“陽光包含彩虹的所有顏色/為什麼植物進化到反射綠色”這樣的長句中，合理停頓能讓聽眾更清晰地理解邏輯。通過“英語影子跟讀”練習，你能逐漸掌握這種節奏，讓口語更地道。

無論是“shadowing site”上的素材還是日常影片，只要堅持模仿，你會發現自己的英語口語越來越流暢。記住，重點不是“背誦”，而是“內化”母語者的表達習慣，讓你的英語聽起來更自然、更有說服力。

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
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 you ever wondered · have studied · has allowed
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	is found · is released

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。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: Why Are Leaves Green? - 通過影片學習英語口語

選擇練習模式

下載應用

同頻道

Highway vs Freeway: What's the Difference?

Why Americans REFUSE to Dry Clothes Outside

How Do Fish Fly Without Wings? The Truth Explained

What's Inside a Credit Card Chip? How It Actually Works

Warm Water vs. Cold Water: The Cleaning Truth

The Hidden Reason Your Phone Keeps Losing Battery

How Is Salt Made? The Process Behind Salt Production

Why Is It Called “Ketchup” and Not Just Tomato Sauce?

How Was Sushi Invented?

Do Phones 'Listen' to Our Conversations? (And How to Stop Them)

How Do QR Codes Work?

Why Are Some Grapes Seeded and Others Seedless?

Why are School Buses Painted Yellow?

Why Wooden Cutting Boards Are Better Than Plastic

The Real Reason Grocery Stores Put Essentials in the Back

College vs. University: What’s the Real Difference?

Do Fish Need Water… When They're Already In It?

Why Does the Sky Turn Red at Sunset?

推薦影片

Why do Humans Have Different Skin Colors?

Why Are There No Holes Around Trees?

TOEFL 2026 Listening Practice: Listen to 2 Academic Talks

Climate Change: How does it really work? | ClimateScience #1

Importance of Bees

What Do Plants Needs to Live and Grow

SUMMARIZE SPOKEN TEXT - DNA & RNA

The Only Video on Maxwell’s Equations You’ll Ever Need

Mars Used to Be Blue... Then Something Happened

What Actual Aliens Might Look Like

Why Don't Blue Whales Eat Fish?

bài học 13 - 2

你能學到什麼

注意這些發音現象

像母語者一樣表達

影片中的語法

什麼是跟讀法？