跟读练习: How An Igloo Keeps You Warm - 通过视频学习英语口语
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69 句
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For thousands of years, humans and plants and animals long before that have been using frozen sky water to keep warm.
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Which sort of doesn't make sense, because snow is cool.
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You might even say it's ice cold.
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No one knows for sure who built the first igloo, but with the right fit and the right physics,
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snow can actually warm you better than the inside of a tauntaun.
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You'll be okay, Luke!
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So how can something cold keep you cozy?
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The vast, frozen
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Arctic is one of the most forbidding environments on our planet.
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Yet the Inuit have managed to live there for about 5 ,000 years.
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Out on the pack ice, winter temperatures reach 50 degrees below zero.
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And when it's that cold, surviving means finding shelter.
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It's not an area known for its forests.
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So nomadic hunters learn to build with the only thing available, snow.
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Eskimo languages really do have dozens and dozens of different words for snow, because there are a lot of different types,
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and the type of snow you choose can dictate whether your igloo keeps you warm, or turns you into a homo sapiensicle.
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To understand this, we need to know a little something about being cold.
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When your body temperature starts to plummet, you're feeling heat leave you you.
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Cold can't move into your body.
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In fact, there's no such thing as cold.
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Where have I heard that before?
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Oh, right.
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Think of heat as an actual quantity of stuff.
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The more you give away, the colder you feel.
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And this trading of heat can happen in three different ways, by convection, conduction, and radiation.
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All three are at play in an igloo.
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A person inside will radiate body heat, which moves around the igloo by convection and is lost through the walls by conduction.
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This is exactly what happens in your house.
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Living insulation does the same thing.
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Fatty tissues like blubber help stop heat transfer in whales and seals, but for animals who don't have as much junk in the trunk,
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they cover themselves in air.
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Sea otter fur, for example, is about a thousand times denser than human hair.
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It's snuggly stuff.
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This is the softest thing I've ever felt in my life.
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You are adorable but the secret to its insulation power is in its texture.
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Otter fur is spiky, so it traps insulating air molecules.
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And that is exactly what snowflakes do.
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Powdery, fresh snow can be up to 95 % trapped air.
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This makes it an excellent insulator, but the same way you have to pack it in your hands to make a snowball,
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it isn't dense enough to build with.
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Solid ice, on the other hand, makes a good windbreaker, but it's too heavy to lift.
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Inuit hunters took the Goldilocks approach.
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The secret to good igloo snow is somewhere in the middle.
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Traditional igloo blocks aren't molded, they're cut out of the ground.
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That tightly packed ground snow is dense enough to hold up, but because it still has far more air pockets than a block of ice,
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it's light, and still a pretty good insulator.
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As usual, animals figured this one out long before humans.
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Polar bears, groundhogs, even birds like grouse all make snow burrows to stay warm.
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Even before that, plants were tucking into snow to avoid death by freezing.
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During the warm months, heat energy from the sun builds up in soil, and just like the roof above your head,
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a deep covering of snow prevents that heat from escaping onward and upward.
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The snowy blanket above stops ice crystals from forming inside plant roots and shoots and seeds.
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Not freezing to death is a pretty good motivator for any animal to get crafty,
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but our big primate brains took it one step further with igloos.
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Their engineering maximizes warmth and stability.
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Cartoon igloos look like flat -bottomed half -spheres, but in reality they're neither of those things.
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If you were to slice a real igloo in half, you'd see a shape called a catenary.
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This gradually sloping shape is the same one that would form
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if you held a chain from both ends and let it droop.
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A catenary arch distributes weight more evenly than a half circle, without bulging or buckling.
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In fact, it's one of the most stable arches in nature, so sound that we still use it today.
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Inside, snow houses are carved in different levels.
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The hot air rises and the cold air sinks down into the lower part, away from where you would eat, sleep, and chill.
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To boot, body heat melts the innermost layer of the walls, strengthening the barrier between between you,
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your airy snowblock insulation, and the frigid great beyond.
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When you live in an igloo, you act as a living furnace.
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Over time, the temperature in your icy abode can hover some 40 to 60 degrees above the surrounding air,
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but bring a friend to your igloo party and you'll get warmer faster.
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Stay cozy, and stay curious.
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本课的词汇与口语要点
这节口语课以视频“How An Igloo Keeps You Warm”为素材。 视频中反复出现的词有：snow, igloo, heat, cold, warm。 这段视频共有 56 个句子、872 个单词可供跟读。 讲话部分时长为 5:12。 说话人语速自然，每分钟约 167 个词，接近日常对话。 只有 79% 的单词属于英语最常用的 3,000 词，词汇难度较高。
视频中的重点词汇
视频中 15 个值得学习的单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| freeze 动词 | /ˈfɹiːz/ | 凍結 /冻结, 凍 /冻 |
| dense 形容词 | /ˈdɛns/ | 密, 稠密 |
| insulation 名词 | /ˌɪnsəˈleɪʃən/ | 孤立 |
| hunter 名词 | /ˈhʌntɚ/ | 獵犬 /猎犬 |
| trap 名词 | /tɹæp/ | 陷阱, 圈套 |
| arch 名词 | /ɑɹt͡ʃ/ | 拱形, 拱 |
| vast 形容词 | /væst/ | 浩大 |
| pocket 名词 | /ˈpɑ.kɪt/ | 口袋, 荷包 |
| stable 名词 | /ˈsteɪ.bəl/ | 馬厩, 馬棚 /马棚 |
| curious 形容词 | /ˈkjʊɹ.i.əs/ | 好奇, 有好奇心 |
| soil 名词 | /sɔɪl/ | 土壤, 泥土 |
| crystal 名词 | /ˈkɹɪstəl/ | 結晶 /结晶 |
| layer 名词 | /ˈleɪ̯ɚ/ | 層 /层 |
| physics 名词 | /ˈfɪz.ɪks/ | 物理學 /物理学 |
| seed 名词 | /siːd/ | 種子 /种子, 種 /种 |
值得反复跟读的句子
视频中简短而完整的句子，可以直接用在日常对话里：
- You might even say it’s… ice cold.
- Where have I heard that before?
- Here's an idea, you should go check it out.
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事 | have managed · have I heard · I've ever felt |
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | is lost · aren't molded · are carved |
| 比较级 -er than / more … than — 比较两个事物 | better than · denser than · more evenly than |
| 最高级 the -est / the most … — 一组中最高或最低的 | the most forbidding · the softest · the most stable |
需要注意的发音
说话人用了 12 次缩略和弱读形式，例如 they're, you'll, aren't。请按听到的简短形式来说。
- “th” 音: strengthen /ˈstɹɛŋ(k)θən/, warmth /wɔɹmθ/
- “sh” 和 “zh” 音: insulation /ˌɪnsəˈleɪʃən/, tissue /ˈtɪʃ.(j)u/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, shelter /ˈʃɛltə/, conduction /kənˈdʌkʃən/
- 长单词——注意重音位置: insulation /ˌɪnsəˈleɪʃən/, stability /stəˈbɪlɪti/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, adorable /əˈdoɹ.əˌbəl/, catenary /ˈkætəˌnɛɹi/
中文母语者容易读错的音：
- /v/ — 不要读成 /w/，上齿轻触下唇: vast /væst/, evenly /ˈiːvənli/, convection /kənˈvɛkʃən/, carve /kɑɹv/, hover /ˈhɒvə/
- 词尾辅音 — 要读清楚，后面不要加元音: freeze /ˈfɹiːz/, dense /ˈdɛns/, trap /tɹæp/, arch /ɑɹt͡ʃ/, vast /væst/
- /r/ 和 /l/ 的区别: crystal /ˈkɹɪstəl/, gradually /ˈɡɹæd͡ʒuəli/, adorable /əˈdoɹ.əˌbəl/, insulator /ˈɪn.s(j)ə.leɪ.tə(ɹ)/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 freeze, dense, insulation 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。