1. When we make a speech , we often use a microphone.
    我们讲演时经常使用麦克风。

2. Then, through the microphone, he spoke into my ear:
    然后，我的耳中传来他通过麦克风发出的指令：

3. He was obviously were very nervous and for some minutes stood awkwardly before the microphone.
    他显然十分紧张，局促不安地站在话筒前有好几分钟。

4. He was obviously very nervous and for some minutes stood awkwardly before the microphone.
    他显然非常紧张，局促不安地在麦克风前站了好几分钟。

5. "You must have to be an engineer or computer scientist to fly this airplane," I commented over the microphone.
    我通过麦克风发表了自己的看法："驾驶这架飞机，你得是个工程师或者是名计算机科学家。"

6. Meanwhile, a microphone, which was lowered into the mine two hours ago, has enabled the men to keep in touch with their closest relatives.
    与此同时，两个小时以前放下井去的一只麦克风使井下的人可以与其亲属保持联系。

7. (DNA is a very long, ribbon -like molecule that contains our genetic information.)
    （DNA是一种含有我们的基因信息的狭长带状分子。）

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