重点讲解：
1. once in a while 偶尔；间或；
例句：Once in a while he indulged in a bottle of good wine.
他偶尔也享受一下，喝上一瓶好酒D=7.gsl5Xefs-v。
2. wear out (使)磨损；(使)用坏；
例句：Every time she consulted her watch, she wondered if the batteries were wearing out.
每次她看手表，都会怀疑是不是电池没电了]ekB!_;RCJ[apRAL。
3. every now and then 不时；有时；偶尔；
例句：She looked out of the window every now and then.
她不时向窗外探望8uusvi-w)KoN*。
4. get rid of 扔掉；丢弃；
例句：We have to get rid of these old newspapers.
我们必须把这些旧报纸处理掉MJoH3^yM;tRY。