跟读练习: Science in English #4 | Compounds and chemical formulas - 通过视频学习英语口语

这段视频共有 45 个句子、341 个单词可供跟读。 讲话部分时长为 2:51。 说话人语速平稳，每分钟约 120 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 个不太常见的单词，附发音和释义：

• compound /ˈkɑmpaʊnd/ (名词) — 化合物. Anything made by combining several things.
• element /ˈɛləmənt/ (名词) — 要素. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.
• atom /ˈætəm/ (名词) — 原子. The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
• formula /ˈfɔː.mjʊ.lə/ (名词) — 公式. Any mathematical rule expressed symbolically.
• substance /ˈsʌbstəns/ (名词) — 物質 /物质. Physical matter; material.
• molecule /ˈmɑ.lɪ.kjul/ (名词) — 分子. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by…
• oxygen /ˈɑksɪd͡ʒən/ (名词) — 氧. The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental…
• connect /kəˈnɛkt/ (动词) — 連接 /连接. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
• combine /kəmˈbaɪn/ (动词) — 結合 /结合, 組合 /组合. To bring (two or more things or activities) together; to unite.
• hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/ (名词) — 氫 /氢. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
• everyday /ˈɛvɹiˌdeɪ/ (形容词) — 日常的. Appropriate for ordinary use, rather than for special occasions.
• lesson /ˈlɛs.ən/ (名词) — 課業 /课业, -課 /-课. A section of learning or teaching into which a wider learning content is divided.
• compare /kəmˈpɛɚ/ (动词) — 比, 比較 /比较. To assess the similarities and differences between two or more things [“to compare X with Y”]. Having made the comparison of X with Y, one might have found it…
• discover /dɪˈskʌvə/ (动词) — 發現 /发现, 發覺 /发觉. To find or learn something for the first time.
• ratio /ˈɹeɪ.ʃoʊ/ (名词) — 比, 比例. A number representing a comparison between two named things.

视频中出现的短语动词

• find out (动词) — 找出, 查明. To discover, as by asking or investigating.
• look at (动词) — 觀察 /观察, 看. To observe or watch.

如何用这段视频练习

1. 先完整听一遍视频，不要开口，记下不认识的单词。
2. 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。
3. 录下自己的声音并与原声对比，特别注意 compound, element, atom 这类单词。

视频中的语法

说话人最常用的结构，并附上视频中的原话：