跟读练习: How do stem cells work in the body? - 通过视频学习英语口语

Whenever there is an injury or a challenge to an organ or tissue, a whole process of renewal takes place in the body to help restore optimal health.

Soon after the injury, the affected tissue releases specific compounds that travel through the blood to the bone marrow.

When the compounds released by the injured tissue reach the bone marrow,

these messengers tell the stem cells in the bone marrow to divide and create new stem cells, which are then released from the bone marrow into the bloodstream.

Slowly, the number of stem cells increases in the blood circulation.

At the same time, the affected the affected tissue releases another compound called stromal-derived factor 1, or SDF1, that attracts stem cells.

As stem cells circulate in the fine blood vessels of the affected tissue and sense the presence of this compound,

they stop in the blood flow and migrate into the tissue.

Inside the tissue, stem cells slowly migrate to the very site of injury where SDF1 is being secreted.

When they reach the site of the injury and come into contact with the damaged tissue,

stem cells begin to multiply and then slowly transform into cells of that tissue.

Through this process of amplification, one stem cell can become thousands of tissue cells.

It is through this natural process of renewal that the body maintains optimal health every day of our lives.

Stemregen is a natural product made of plant extracts

that have been documented to support the release of stem cells from the bone marrow, thereby increasing the number of circulating stem cells.

More stem cells in circulation means that more stem cells are available to participate in the process of tissue repair.

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34 句

本课的词汇与口语要点

这节 C1 级别的口语课以视频“How do stem cells work in the body?”为素材。视频中反复出现的词有：cell, stem, tissue, marrow, bone。这段视频共有 16 个句子、284 个单词可供跟读。讲话部分时长为 2:02。说话人语速平稳，每分钟约 140 个词，很适合跟读。只有 73% 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 12 个单词，附发音和释义：

单词	发音	释义
marrow 名词	/ˈmæɹəʊ/	髓, 骨髓
circulate 动词	/ˈsɝ.kjʊˌleɪt/	环绕
migrate 动词	/maɪˈɡɹeɪt/	迁徙
renewal 名词		更新
optimal 形容词	/ˈɑptɪməl/	最佳的
bloodstream 名词	/ˈblʌd.stɹɪim/	血液, 血流
injure 动词	/ˈɪn.d͡ʒɚ/	傷害 /伤害, 損傷 /损伤
multiply 动词	/ˈmʌltɪplaɪ/	增長 /增长
messenger 名词	/ˈmɛs.ən.d͡ʒɚ/	信使, 使者
extract 名词	/ˈɛkstɹækt/	精
thereby 副词	/ðɛɹˈbaɪ/	從而 /从而, 因此
transform 动词	/tɹænsˈfɔɹm/	變換 /变换, 變形 /变形

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	being secreted · have been documented
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	have been documented
定语从句 who / which + 从句 — 补充说明人或事物	cells, which are

需要注意的发音

“sh” 和 “zh” 音: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/
长单词——注意重音位置: circulation /ˌsɝkjʊˈleɪʃən/, amplification /ˌæmplɪfɪˈkeɪʃən/

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: circulate /ˈsɝ.kjʊˌleɪt/, migrate /maɪˈɡɹeɪt/, derive /dɪˈɹaɪv/, extract /ˈɛkstɹækt/
/r/ 和 /l/ 的区别: bloodstream /ˈblʌd.stɹɪim/, stromal /ˈstɹəʊ̯.məl/
/æ/ — 嘴张大，不要读成 /e/: marrow /ˈmæɹəʊ/, amplification /ˌæmplɪfɪˈkeɪʃən/, extract /ˈɛkstɹækt/, transform /tɹænsˈfɔɹm/

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 marrow, circulate, migrate 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。

影子跟读法: 阅读完整分步指南 →

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