词汇讲解：
1. trial n. 测试, 试验, 考验
例句：They are doing clinical trials on a new drug.
他们正在做一种新药物的临床试验。
2. drill n. 操练, 训练
例句：The recruits drilled regularly.
新兵们定时操练。
3. ambulance n. 救护车
例句：He was sent to hospital by ambulance.
救护车将他送往医院。
4. surgery n. 外科诊所; 外科手术
例句：Your condition is serious and requires surgery.
你的情况很严重, 需要动外科手术。
5. provide vt. 提供
例句：On Sundays his landlady provided dinner as well as breakfast.
星期天,他的女房东不但供给早餐,还供给晚餐。
6. timely adj.适时的; 合时宜的；及时的
例句：Your arrival was most timely yesterday.
你们昨天来得非常及时。
7. coverage n. 覆盖范围
例句：This is an insurance policy with extensive coverage.
这是一项承保范围广泛的保险。
8. seek v. 寻找; 探寻
例句：We sought long and hard but found no answer.
我们作了长期的艰苦探索, 但没有找到答案。
9. affordable adj. 付得起的, 不太昂贵的
例句：There are few affordable apartments in big cities.
在大城市中没有几所公寓是便宜的。
10. portion n. 一部分, 一份
例句：You are paid your portion not later than a week.
不会晚于一周你就可以得到你那一部分报酬。
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