重点讲解：
1. in the middle of (某件事或某段时间的)中期；
例句：She came in the middle of the day.
她在中午的时候来了zV-~#OAg5#*z.Cp=。
2. wait on 服务；服侍；招待；
例句：There were plenty of servants to wait on her.
有很多仆人服侍她CRjv&8_H#^].yBz0vf+1。
3. fall out (头发、牙齿)掉落，脱落；
例句：Her hair started falling out as a result of radiation treatment.
由于放疗，她开始掉头发06A|EAz#vtm3MS)UK。
4. be afraid of 害怕的；恐惧的；
例句：Some children are afraid of the dark.
有些小孩怕黑DwoD%Z+-b0*c~;。