跟读练习: Science in English #6 | Types of Mixtures - 通过视频学习英语口语
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Good morning, everyone.
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Today we are going to learn about types of mixtures.
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We will discover how different substances can mix together.
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Let's get started.
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Imagine you add food coloring to water.
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It spreads evenly throughout the water.
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Now add oil to water.
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Even after stirring, the oil stays separate.
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Why do these two mixtures look different?
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Let's find out.
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Let's begin with our learning objectives.
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By the end of this lesson, you will understand what a mixture is.
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You will learn the difference between pure substances and mixtures.
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You will identify homogeneous and heterogeneous mixtures.
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Before learning about mixtures, Let's review pure substances.
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Elements and compounds are pure substances.
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A mixture is a physical combination of two or more substances.
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The substances are not chemically bonded.
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Let's look at some examples.
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Air is a mixture of different gases.
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Food coloring and water form a homogeneous mixture.
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Oil and water form a heterogeneous mixture.
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Salad is another heterogeneous mixture.
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In a mixture, substances stay together physically.
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They do not form new chemical bonds.
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Because of this, they can usually be separated again.
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Gold can be separated from water.
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Oil can also be separated from water.
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There are two main types of mixtures.
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Homogeneous mixtures have a uniform composition.
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Heterogeneous mixtures have a non-uniform composition.
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Let's compare the two types of mixtures.
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Homogeneous mixtures look the same throughout.
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Heterogeneous mixtures have visible different parts.
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This is the easiest way to tell them apart.
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Let's review what we have learned today.
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A mixture is a physical combination of substances.
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Mixtures can usually be separated by physical methods.
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There are homogeneous and heterogeneous mixtures.
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In our next lesson, we will learn about the properties of homogeneous mixtures.
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Thank you for listening.
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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“Science in English”为素材。 视频中反复出现的词有：mixture, substances, heterogeneous, homogeneous, separated。 这段视频共有 41 个句子、289 个单词可供跟读。 讲话部分时长为 2:30。 说话人语速平稳，每分钟约 116 个词，很适合跟读。 只有 72% 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
视频中最难的 15 个单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| mixture 名词 | /ˈmɪkst͡ʃɚ/ | 混合 |
| substance 名词 | /ˈsʌbstəns/ | 物質 /物质 |
| lesson 名词 | /ˈlɛs.ən/ | 課業 /课业, -課 /-课 |
| composition 名词 | /ˌkɑm.pəˈzɪʃ.ən/ | 成分 |
| uniform 名词 | /ˈjunɪˌfɔɹm/ | 制服, 校服 |
| element 名词 | /ˈɛləmənt/ | 要素 |
| compare 动词 | /kəmˈpɛɚ/ | 比, 比較 /比较 |
| discover 动词 | /dɪˈskʌvə/ | 發現 /发现, 發覺 /发觉 |
| visible 形容词 | /ˈvɪzɪb(ə)l/ | 看得見 /看得见, 可看見的 /可看见的 |
| objective 名词 | /ɒbˈd͡ʒɛk.tɪv/ | 目標 /目标, 目的 |
| compound 名词 | /ˈkɑmpaʊnd/ | 化合物 |
| salad 名词 | /ˈsæl.əd/ | 色拉, 沙拉 |
| stir 动词 | /stɝ/ | 攪拌 /搅拌, 攪 /搅 |
| heterogeneous 形容词 | /ˌhɛt.(ə.)ɹəˈd͡ʒiː.ni.əs/ | 異質 /异质 |
| homogeneous 形容词 | /ˌhoʊ.moʊˈd͡ʒi.ni.əs/ | 同質 /同质 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| find out 动词 | 找出, 查明 |
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：
- Let's begin with our learning objectives.
- Let's look at some examples.
- Let's compare the two types of mixtures.
- Let's review what we have learned today.
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 | be separated · can be separated |
| “will” 表将来 will + 动词 — 决定、承诺或预测 | will discover · will understand · will learn |
需要注意的发音
- 长单词——注意重音位置: composition /ˌkɑm.pəˈzɪʃ.ən/, heterogeneous /ˌhɛt.(ə.)ɹəˈd͡ʒiː.ni.əs/, homogeneous /ˌhoʊ.moʊˈd͡ʒi.ni.əs/
中文母语者容易读错的音：
- /v/ — 不要读成 /w/，上齿轻触下唇: discover /dɪˈskʌvə/, visible /ˈvɪzɪb(ə)l/, objective /ɒbˈd͡ʒɛk.tɪv/, evenly /ˈiːvənli/
- 词尾辅音 — 要读清楚，后面不要加元音: substance /ˈsʌbstəns/, element /ˈɛləmənt/, objective /ɒbˈd͡ʒɛk.tɪv/, compound /ˈkɑmpaʊnd/, salad /ˈsæl.əd/
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 mixture, substance, lesson 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。