1. life expectancy 预期寿命，平均寿命

2. get out of hand 失控

3. be fed up with 感到厌烦；讨厌；对……感到厌烦；厌烦

4. 某人对某事不熟悉的两种表达
sb. is unfamiliar with sth.
sth. is unfamiliar to sb.

5. come down with sth. 生病

6. boil down to sth. 归结为

7. frown on sth. 不悦；蹙眉不悦；对……不赞成；不赞成某事

8. do nothing but do 固定用法

9. in honor of sb./sth. 纪念某人/某事

10. There’s no point in doing sth. 做某事无意义

11. nothing but 只有；只不过 anything but 根本不；除…以外任何事

12. rarely, seldom, hardly, scarcely

Rarely和seldom意思都是“很少”（表频率），seldom更正式、更书面。
Hardly和scarcely意思都是“几乎不”或者“刚刚”（表程度）。相比之下scarcely更正式、更书面。

People rarely ask questions.
She was seldom seen in public.
I hardly had time to ask her name.
We had scarcely arrived when he asked us to leave.