跟读练习: phienma - 通过视频学习英语口语
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15 句
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Transcription begins when an enzyme called RNA polymerase attaches to a segment of DNA called a gene.
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A gene contains the code to build a specific protein, which is a macromolecule made up of a sequence of amino acids.
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RNA polymerase causes a particular area of the DNA helix to unwind and separate into two strands.
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One of the strands, often called the template strand, is the side of DNA that is read or transcribed by the messenger RNA.
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The other strand of DNA, often called the non -template strand, isn't transcribed by the messenger RNA.
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So, how are DNA instructions transcribed into messenger RNA?
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Well, using the template strand as a guide,
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RNA polymerase uses the base pair rule to assemble free nucleotides in the nucleus into a complementary strand of RNA.
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For example, RNA polymerase reads the DNA base thymine on the template strand,
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then binds it to a free nucleotide containing adenine.
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This process continues with cytosine binding to guanine and guanine binding with cytosine.
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Remember, though, RNA will never contain thymine.
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So, whenever RNA polymerase sees adenine on the DNA template strand, it pairs adenine with uracil.
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By using the template strand of DNA as a guide,
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the genetic code from the non -template strand of DNA has actually been transcribed into Messenger.
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本课的词汇与口语要点
视频中反复出现的词有：strand, Rna, Dna, template, polymerase。 这段视频共有 15 个句子、217 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 114 个词，很适合跟读。 只有 59% 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 |
|---|---|---|
| strand 名词 | /ˈstɹænd/ | 綹 /绺, 一綹頭髮 /一绺头发 |
| template 名词 | /ˈtɛm.plɪt/ | 模板, 型板 |
| messenger 名词 | /ˈmɛs.ən.d͡ʒɚ/ | 信使, 使者 |
| gene 名词 | /d͡ʒiːn/ | 基因 |
| acid 名词 | /ˈæsɪd/ | 酸 |
| sequence 名词 | /ˈsiː.kwəns/ | 序列, 順序 /顺序 |
| segment 名词 | /ˈsɛɡmɛnt/ | 片斷 /片断, 段 |
| instruction 名词 | /ɪnˈstɹʌkʃən/ | 教導 /教导 |
| enzyme 名词 | /ˈɛn.zaɪm/ | 酶, 酵素 |
| attach 动词 | /əˈtæt͡ʃ/ | 附上, 附 |
| amino 名词 | /əˈminoʊ/ | 氨基 |
| assemble 动词 | /əˈsɛm.bəl/ | 收集, 組合 /组合 |
| nucleus 名词 | /ˈnuː.kli.əs/ | 核心, 核 |
| polymerase 名词 | 聚合酶 | |
| transcribe 动词 | /trænˈskɹaɪb/ | 轉寫 /转写 |
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 read · isn't transcribed · been transcribed |
| 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 | has actually been transcribed |
| 定语从句 who / which + 从句 — 补充说明人或事物 | protein, which is |
需要注意的发音
- “sh” 和 “zh” 音: instruction /ɪnˈstɹʌkʃən/, transcription /tɹænˈskɹɪpʃən/
- 长单词——注意重音位置: complementary /ˌkɑmplɪˈmɛnt(ə)ɹi/, macromolecule /ˈmækɹəʊˌmɒlɪkjuːl/
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: strand /ˈstɹænd/, template /ˈtɛm.plɪt/, bind /ˈbaɪ̯nd/, acid /ˈæsɪd/, sequence /ˈsiː.kwəns/
- /r/ 和 /l/ 的区别: complementary /ˌkɑmplɪˈmɛnt(ə)ɹi/, macromolecule /ˈmækɹəʊˌmɒlɪkjuːl/, uracil /ˈjʊərəsɪl/
- /æ/ — 嘴张大，不要读成 /e/: strand /ˈstɹænd/, acid /ˈæsɪd/, attach /əˈtæt͡ʃ/, transcription /tɹænˈskɹɪpʃən/, transcribe /trænˈskɹaɪb/
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 strand, template, messenger 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。