重点讲解：
1. every once in a while
不时；有时；偶尔；
eg. He comes to our room for a chat every once in a while.
他偶尔来我们房中闲谈。
eg. I watched things change and made observations every once in a while.
我观察着事物的变化，时不时地提出我的意见。
2. off-color
不舒服的；身体欠佳的；心情不好；
eg. For three weeks Maurice felt off-colour but did not have any dramatic symptoms.
莫里斯连续3周都不大舒服，但又没有什么明显的症状。
eg. She's been a bit off - color recently.
她最近气色不怎么好。
3. take it easy
别太拼命；放松点；
eg. He was going to take it easy when he got back.
他回去以后，要过轻松的日子。
eg. All a man got to do is to take it easy and he'll enjoy himself.
做人只要把心放开些,就能过得快活。
4. rest up
休养，休息；
eg. You had better go home and rest up a little.
你最好回家休息一下。
eg. I think I'll just rest up for an hour or two before starting work again.
我看我还是好好休息一两个小时再开始工作吧。