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。
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。
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。
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。
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