跟读练习: Class Presentation: Why Is the Sky Blue? - 通过视频学习英语口语
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1
Right, everyone, settle down, please.
2
Oliver's presenting his science project today.
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Um... morning, everyone.
4
So, my question today is, why is the sky blue?
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First, sunlight looks white, doesn't it?
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But actually, it's a mix of all the colours,
7
like a rainbow, from red to violet.
8
Oh, like light through a prism?
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Yes, exactly! Brilliant.
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Now, when sunlight comes into our air,
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it hits tiny gas particles, much smaller than dust.
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Blue light has short waves,
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so it bounces around much more than red light.
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It's called Rayleigh scattering, and it fills the sky with blue!
15
Okay, let me show you a quick experiment!
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This is just water with a little milk in it.
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Could someone turn off the lights, please?
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Look! From the side, the water looks a bit blue.
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No way! It really does look blue!
20
Hang on, I've got a question.
21
If blue scatters more, why are sunsets red, then?
22
Oh... um, good question.
23
Wait, look at the torch through the end of the glass!
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Whoa, the light looks orange now!
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At sunset, light travels through much more air,
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so most of the blue gets scattered away.
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Only the red and orange light reaches our eyes!
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Oh, and violet scatters even more than blue,
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but our eyes are much better at seeing blue.
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So, that's why the sky is blue, not purple!
31
Well done, Oliver! That was excellent.
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You started a bit quietly, though.
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Next time, speak up from the very beginning.
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I will. Thanks, miss!
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本课的词汇与口语要点
这节 B1 级别的口语课以视频“Class Presentation: Why Is the Sky Blue?”为素材。 这段视频共有 34 个句子、249 个单词可供跟读。 讲话部分时长为 1:54。 说话人语速平稳，每分钟约 131 个词，很适合跟读。 83% 的单词属于英语最常用的 3,000 词，其余的词建议在练习前先学一下。
视频中的重点词汇
视频中最难的 12 个单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| sunset 名词 | /ˈsʌnˌsɛt/ | 日落 |
| sunlight 名词 | /ˈsʌnˌlaɪt/ | 陽光 /阳光, 日光 |
| violet 名词 | /ˈvaɪ.ə.lət/ | 紫羅蘭 /紫罗兰, 堇菜 |
| dust 名词 | /dʌst/ | чынтў, хуэйтў |
| experiment 名词 | /ɪkˈspɛɹ.ə.mənt/ | 實驗 /实验 |
| purple 名词 | /ˈpɝ.pl̩/ | 紫色 |
| quietly 副词 | /ˈkwaɪ.ɪt.li/ | 悄悄地, 安靜地 /安静地 |
| particle 名词 | /ˈpɑɹtək(ə)l/ | 粒子 |
| whoa | /woʊ/ | 吁 |
| torch 名词 | /ˈtɔːtʃ/ | 薪火, 火炬 |
| scatter 动词 | /ˈskætɚ/ | 散佈 /散布 |
| prism 名词 | /ˈpɹɪzəm/ | 稜柱 /棱柱 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| settle down 动词 | 冷靜下來 /冷静下来 |
| turn off 动词 | 關 /关, 關掉 /关掉 |
需要注意的发音
中文母语者容易读错的音：
- 词尾辅音 — 要读清楚，后面不要加元音: sunset /ˈsʌnˌsɛt/, sunlight /ˈsʌnˌlaɪt/, violet /ˈvaɪ.ə.lət/, dust /dʌst/, experiment /ɪkˈspɛɹ.ə.mənt/
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。
- 用正常速度逐句跟读，每句重复到你的节奏与说话人一致为止。
- 录下自己的声音并与原声对比，特别注意 sunset, sunlight, violet 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。