1. convey v. 传达
A vibrating membrane in the ear helps to convey sounds to the brain.
耳膜的振动帮助声音传送到大脑。
2. collapse v. 坍塌
The roof collapsed under the weight of snow.
房顶在雪的重压下突然坍塌下来。
3.crude a. 未加工的
crude oil 原油
This crude glycerin is from pure virgin vegetable oil.
这是未加工的甘油，来自纯净原始的植物油。
4. concession n. 让步
They interpreted her silence as concession.
他们把她的沉默解读为让步。
5. defect n. 缺陷
The new car had to be withdrawn from the market because of a mechanical defect.
那种新汽车因有机械缺陷只好撤出市场。
6. deliberate a. 故意的=on purpose
It had more the appearance of a deliberate crime than an accident.
那很像是蓄意的罪行，而不像是意外的事故。
7. depress v. 使沮丧
The thought of having to take the exam again depressed me.
想到还需重新考试，我就感到沮丧。
8. detect v. 发现
词义辨析：discover, find, detect, ascertain
discover: 指发现本来已经存在，后被人认识的事物、真理或情况
find: 普通用词，可指偶然发现，也可指经过寻找后得到或重新获得已失去的东西。强调动作的结果
detect: 正式用词，强调经过周密观察或研究而有所获得和发现，尤指发现有意隐藏之物
ascertain: 较正式用词，指有意搜寻与发现
If you read between the lines, you can detect his contrived explanation.
在字里行间，你可以看出他牵强的解释。
9. descend v. 下降
词义辨析：descend, drop, fall, sink
descend: 通常指沿斜线或斜坡下降
drop: 指物体从一定高度落下
fall: 与drop同义，指突然或猛烈地降落，但fall也可指任何下落，同高度或形式无关
sink: 指在空气或水中垂直下降、下沉
The sun descended behind the hills.
太阳下山了。
10. dim a. 昏暗的
Most comets are so dim that they can not be seen by the naked eye.
彗星很暗淡，肉眼看不见。