跟读练习: Reversible and Irreversible Changes to Matter - 通过视频学习英语口语

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Matter can change in different ways.

When we play with modelling clay, for example, we can transform it into different shapes by pushing, pulling or twisting.

We can also roll it back into its original shape.

This is a reversible change.

Heat can also change matter.

When we add heat to ice, it melts and becomes water.

This is called melting.

If we cool the water, it changes back into solid ice.

This is called freezing.

Melting and freezing are reversible changes.

But some changes are irreversible.

When we cook a raw egg, it changes from liquid to solid.

Even if it cools down, it won't become a raw egg again.

Cutting a piece of paper is also irreversible.

Once it's cut, we can't turn the pieces back into a whole paper.

Burning is another irreversible change.

When we burn a piece of paper, it turns into ash, which can't be turned back into paper.

Rusting is also irreversible.

When iron reacts with water and oxygen, it rusts.

Rust can't be transformed back into iron.

Chemical reactions can cause irreversible changes too.

When vinegar and baking soda react, they create carbon dioxide gas, which can't be turned back into vinegar and baking soda.

Remember, some changes are reversible, like shaping clay or melting and freezing water.

But others, like cooking an egg, cutting paper, burning, rusting or chemical reactions, are irreversible.

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本课的词汇与口语要点

这节口语课以视频“Reversible and Irreversible Changes to Matter”为素材。视频中反复出现的词有：irreversible, paper, reversible, melting, freezing。这段视频共有 25 个句子、235 个单词可供跟读。讲话部分时长为 2:01。说话人语速平稳，每分钟约 116 个词，很适合跟读。只有 76% 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 14 个值得学习的单词，附发音和释义：

单词	发音	释义
melt 动词	/mɛlt/	融化, 熔化
rust 名词	/ɹʌst/	鏽 /锈, 鐵鏽 /铁锈
freeze 动词	/ˈfɹiːz/	凍結 /冻结, 凍 /冻
clay 名词	/kleɪ/	黏土
soda 名词	/ˈsoʊdə/	蘇打 /苏打, 碳酸鈉 /碳酸钠
transform 动词	/tɹænsˈfɔɹm/	變換 /变换, 變形 /变形
bake 动词	/beɪk/	烤, 烘
vinegar 名词	/ˈvɪnəɡɚ/	醋
liquid 名词	/ˈlɪk.wɪd/	液體 /液体, 液態 /液态
oxygen 名词	/ˈɑksɪd͡ʒən/	氧
twist 动词	/twɪst/	扭, 搓
subscribe 动词	/səbˈskɹaɪb/	簽署 /签署
dioxide 名词	/daɪˈɑksaɪd/	二氧化物
irreversible 形容词	/ˌɪr.ɪˈvɝ.sə.bəl/	不可逆

视频中出现的短语动词

单词	发音	释义
cool down 动词	/kuːl ˈdaʊn/	冷卻 /冷却

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
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的	is called · can't be turned · can't be transformed
定语从句 who / which + 从句 — 补充说明人或事物	ash, which can · gas, which can

需要注意的发音

说话人用了 6 次缩略和弱读形式，例如 can't, don't, won't。请按听到的简短形式来说。

长单词——注意重音位置: irreversible /ˌɪr.ɪˈvɝ.sə.bəl/, reversible /ɹəˈvɜː(ɹ)sɪbəl/

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: vinegar /ˈvɪnəɡɚ/, irreversible /ˌɪr.ɪˈvɝ.sə.bəl/, reversible /ɹəˈvɜː(ɹ)sɪbəl/
词尾辅音 — 要读清楚，后面不要加元音: melt /mɛlt/, rust /ɹʌst/, freeze /ˈfɹiːz/, react /ɹiːˈækt/, bake /beɪk/
/r/ 和 /l/ 的区别: irreversible /ˌɪr.ɪˈvɝ.sə.bəl/, reversible /ɹəˈvɜː(ɹ)sɪbəl/

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 melt, rust, freeze 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。

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跟读练习: Reversible and Irreversible Changes to Matter - 通过视频学习英语口语

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