重点讲解：
1. out of order
（机器、设备等）出故障，有毛病
eg. Their phone's out of order.
他们的电话坏了。
eg. He came to the conclusion that the machine was out of order.
他断定机器出了毛病。
2. every now and then
时而；有时；
eg. My father has a collection of magazines to which I return every now and then.
我爸爸收藏了很多杂志，我有时会翻看一下。
eg. Every now and then I get a bit terrified when I'm home alone.
有时候，我独自在家的时候会感到恐惧。