跟读练习: Experimental Variables - 通过视频学习英语口语
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1
A student wants to find out whether the amount of light a plant receives affects how tall it grows.
2
She sets up three identical potted plants, one in normal sunlight, one under a bright grow lamp,
3
and one in a dark cupboard.
4
you you Thank you.
5
But to get a reliable answer, she needs to design this experiment carefully.
6
She needs to understand three types of variables.
7
The first is the independent variable.
8
This is the one thing she deliberately changes, the cause she's testing.
9
Here, that's the amount of light.
10
She's testing three levels: normal, Hi and None you An easy way to remember it I change it.
11
I for independent, I.
12
The second is the dependent variable.
13
This is what she measures, the result.
14
Here, that's the height of each plant, measured in centimeters after a set number of weeks.
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She doesn't control this value.
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She simply records what happens.
17
An easy way to remember, it gives you your data.
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D for dependent, D for data.
19
you The third is the controlled variables.
20
These are everything else that must stay exactly the same to keep the test fair.
21
She uses the same pot size, the same soil, and gives each plant the same amount of water.
22
If she gave one plant more water than the others, she wouldn't know whether it was the light or the extra water that caused any difference in growth.
23
An easy way to remember: keep it fair.
24
Change one thing, measure one thing, keep everything else the same.
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you That's what makes an experiment fair, and that's how scientists find out what really causes what.
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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“Experimental Variables”为素材。 视频中反复出现的词有：plant, variable, fair, amount。 这段视频共有 25 个句子、272 个单词可供跟读。 讲话部分时长为 2:06。 说话人语速平稳，每分钟约 129 个词，很适合跟读。 87% 的单词属于英语最常用的 3,000 词，词汇容易理解。
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 |
|---|---|---|
| experiment 名词 | /ɪkˈspɛɹ.ə.mənt/ | 實驗 /实验 |
| dependent 形容词 | /dɪˈpɛndənt/ | 依靠, 倚賴 /倚赖 |
| carefully 副词 | /ˈkɛɹf(ə)li/ | 小心地 |
| soil 名词 | /sɔɪl/ | 土壤, 泥土 |
| pot 名词 | /pɑt/ | 鍋 /锅, 壺 /壶 |
| reliable 形容词 | /ɹɪˈlaɪəbl̩/ | 可靠, 穩妥 /稳妥 |
| identical 形容词 | /ɪˈdɛntɪkl̩/ | 相同, 同一 |
| scientist 名词 | /ˈsaɪəntəst/ | 科學家 /科学家 |
| lamp 名词 | /ˈlæ̝mp/ | 燈 /灯, 電燈 /电灯 |
| deliberately 副词 | /dɪˈlɪb.(ə.)ɹət.li/ | 故意, 蓄意 |
| sunlight 名词 | /ˈsʌnˌlaɪt/ | 陽光 /阳光, 日光 |
| cupboard 名词 | /ˈkʌb.əd/ | 櫥櫃 /橱柜, 櫃子 /柜子 |
视频中出现的短语动词
| 单词 | 释义 |
|---|---|
| find out 动词 | 找出, 查明 |
需要注意的发音
- 长单词——注意重音位置: experiment /ɪkˈspɛɹ.ə.mənt/, deliberately /dɪˈlɪb.(ə.)ɹət.li/
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: experiment /ɪkˈspɛɹ.ə.mənt/, dependent /dɪˈpɛndənt/, pot /pɑt/, scientist /ˈsaɪəntəst/, lamp /ˈlæ̝mp/
- /r/ 和 /l/ 的区别: variable [ˈvæɹ.i.ə.bl̩], carefully /ˈkɛɹf(ə)li/, reliable /ɹɪˈlaɪəbl̩/, deliberately /dɪˈlɪb.(ə.)ɹət.li/
- /æ/ — 嘴张大，不要读成 /e/: variable [ˈvæɹ.i.ə.bl̩], lamp /ˈlæ̝mp/
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 experiment, dependent, carefully 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。