跟读练习: Structure and Function of a Prokaryotic Cell (Bacteria) - 通过视频学习英语口语

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Today we are going to take a closer look at the structure and function of a prokaryotic cell.

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Prokaryotic cells are the simplest and smallest living organisms.

They are estimated to have been on earth for 3 .5 billion years.

Prokaryotes can be divided into bacteria and archaea.

Prokaryotes are found in many different environments, including soil, water and the human body.

The structure of a typical prokaryotic cell consists of several components.

Firstly, many bacteria have an outermost layer of carbohydrates that is called the capsule.

The capsule is sticky and helps the cell attach to surfaces in its environment.

Also, prokaryotes possess a cell wall surrounding the cell.

The cell wall provides structural support and protection for the cell.

The composition of the cell wall can vary between different types of prokaryotic cells, but it is typically made up of peptidoglycan,

a complex polymer of sugars and amino acids.

Next, the inner of the cell is surrounded by a plasma membrane

that acts as a barrier between the inside of the cell and the external environment.

The plasma membrane is made up of lipids and proteins and is selectively permeable, meaning that only certain molecules can pass through it.

Inside the cell there is a region called the cytoplasm.

The cytoplasm is a gel -like substance that contains all of the cell's components and is site of many cellular processes.

Not all, but many prokaryotes possess flagella.

A flagellum is a long whip -like structure that allows the cell to move through liquid environments.

Again, not all, but some prokaryotic cells have appendages such as pili.

Pili, also known as fimbriae, are short hair -like structures that help the cell attach to surfaces or other cells.

This attachment is important for several bacterial processes, including colonization, biofilm formation and infection.

Prokaryotic cells have a circular piece of DNA called the nucleoid.

The nucleoid contains all the genetic information of the cell and is not surrounded by a nuclear membrane like in eukaryotic cells.

In addition to the nucleoid, prokaryotic cells may also contain plasmids, small circular pieces of DNA that can be transferred between cells.

One of the most important organelles in the cytoplasm of a prokaryotic cell is the ribosome.

Ribosomes are responsible for synthesizing proteins which are the building blocks of life.

Despite their simplicity, prokaryotic cells are capable of carrying out all of the necessary functions of life,

from growth and reproduction to responding to environmental stimuli.

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本课的词汇与口语要点

这节口语课以视频“Structure and Function of a Prokaryotic Cell”为素材。视频中反复出现的词有：cell, prokaryotic, prokaryotes, structure, environment。这段视频共有 32 个句子、453 个单词可供跟读。讲话部分时长为 3:12。说话人语速平稳，每分钟约 142 个词，很适合跟读。只有 74% 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
membrane 名词	/ˈmɛm.bɹeɪn/	薄膜
surround 动词	/səˈɹaʊnd/	包圍 /包围, 圍繞 /围绕
component 名词	/kəmˈpoʊ.nənt/	元件, 部件
possess 动词	/pəˈzɛs/	抱有, 具备
circular 形容词	/ˈsɜɹ.kjə.ləɹ/	圓 /圆
plasma 名词	/ˈplæzmə/	等離子體 /等离子体
attach 动词	/əˈtæt͡ʃ/	附上, 附
capsule 名词	/ˈkæps(ə)l/	蒴果
acid 名词	/ˈæsɪd/	酸
helpful 形容词	/ˈhɛlp.fl̩/	有幫助 /有帮助
soil 名词	/sɔɪl/	土壤, 泥土
layer 名词	/ˈleɪ̯ɚ/	層 /层
liquid 名词	/ˈlɪk.wɪd/	液體 /液体, 液態 /液态
composition 名词	/ˌkɑm.pəˈzɪʃ.ən/	成分
infection 名词	/ɪnˈfɛkʃən/	傳染 /传染

视频中出现的短语动词

单词	发音	释义
carry out 动词	/ˈkæ.ɹi aʊt/	進行 /进行
check out 动词		退房

需要注意的发音

“sh” 和 “zh” 音: composition /ˌkɑm.pəˈzɪʃ.ən/, infection /ɪnˈfɛkʃən/, structural /ˈstɹʌk(t͡)ʃəɹəl/, reproduction /ˌɹiːpɹəˈdʌkʃən/, colonization /kɔlənɪˈzɛjʃən/
长单词——注意重音位置: composition /ˌkɑm.pəˈzɪʃ.ən/, reproduction /ˌɹiːpɹəˈdʌkʃən/, simplicity /sɪmˈplɪsɪti/, organism /ˈɔɹ.ɡəˌnɪz.əm/, prokaryote /pɹoʊˈkæɹi.oʊt/

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: vary /ˈvɛəɹi/, divide /dɪˈvaɪd/
词尾辅音 — 要读清楚，后面不要加元音: surround /səˈɹaʊnd/, component /kəmˈpoʊ.nənt/, possess /pəˈzɛs/, attach /əˈtæt͡ʃ/, acid /ˈæsɪd/
/r/ 和 /l/ 的区别: circular /ˈsɜɹ.kjə.ləɹ/, structural /ˈstɹʌk(t͡)ʃəɹəl/, bacterial [bækˈtɪəɹiəɫ], firstly /ˈfɜɹstli/, organelle /ˌɔɹ.ɡənˈɛl/

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 membrane, surround, component 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 →

跟读练习: Structure and Function of a Prokaryotic Cell (Bacteria) - 通过视频学习英语口语

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