词汇讲解：
1. mount vi. 增加; 上升; 逐步增加
例句：Social problems in modern society are mounting.
现代社会问题日益增加。
2. imperfect adj. 有缺点的,有瑕疵的；不完整的，未完成的
例句：Soot is usually the product of the imperfect combustion of fuel.
煤烟通常是燃料不完全燃烧的产物。
3. chore n. 零星工作(尤指家常杂务)
例句：As a child one of my chores was to feed the animals.
小时候我的杂活之一就是喂动物。
4. impairment n. 损害,损伤
例句：Such activities might lead to serious impairment of competition in the markets involved.
这类活动对有关市场中的竞争可能造成严重损害。
5. participant n. 参加者, 参与者
例句：She is an active participant in this activity.
她积极参与这项活动。
6. expenditure n. 消费;支出;用光
例句：Training a dog requires the expenditure of time and effort.
训练一条狗需化时间和精力。
7. calculate v. 计算, 估计
例句：I calculated that the trip would take two days.
我估计这段路程要走两天时间。
8. equivalent adj. 相等的, 相当的
例句：There is no exactly equivalent French tense to the present perfect tense in English.
法语里没有和
英语中的现在完成时完全对应的时态。
9. convincing adj. 令人相信的;有说服力的
例句：The data you have collected is not enough to be convincing.
你们收集的材料说服力不足。
10. accumulate v. 堆积; 积累
例句：They set to work accumulating a huge mass of data.
他们已开始积累大量的资料。
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