1.the working/middle/upper class 工人/中产/上层阶级
all classes of society 社会各阶层人士
the professional classes 专业阶层
different classes of drugs 不同种类的毒品
be in a different class from most of his contemporaries 与大多数的同代作家相比,更为出类拔萃
be in a class of her own 比大多数同行都要出色
例句：Those who push this reactionary poison in the working class are the trade unions and their various middle class radical allies.
在工人阶级中推行这种反动毒药的是贸易联盟和各种各样的激进的中产阶级盟友。

2.the last vestiges of 最后的残余
例句：With it went the last vestiges of my courage.
随之而去的还有我最后的那一丝胆量。

3.put sb up 留…过夜
例句：She told the Guardian how in 2006 she was working as a personal assistant to the man, who put her up in a hotel so she could be close to work.
在2006年，她是如何以某男子的助理的身份工作的，男子安排她住在一家酒店里，好让她方便工作。

4.set an alarm 定闹钟
Alarm go off 闹钟响了
be in a deep sleep/trance/coma 酣睡；昏睡；昏迷
例句：Every hour, set an alarm on your computer or phone to go off.
在你的闹钟或者手机里设定一个以一个小时为间隔的停下来的时间。