重点讲解：
1. hang up
悬挂；吊；
eg. I found his jacket, which was hanging up in the hallway.
我找到了他那件夹克衫，就在门厅里挂着。
eg. Some prisoners climbed onto the roof and hung up a banner.
几个囚犯爬上房顶，挂起了一面旗子。
2. for sure
无疑；肯定；
eg. It's impossible to know for sure how much you're consuming.
要想知道确切的食盐摄取量几乎是不可能的事情。
eg. No one knows for sure how people first learned to preserve food.
没有人确切地知道当初人们是如何学会保存食物的。
3. put on
穿；戴；涂；抹；
eg. The man put on his smock and went out.
那人穿上罩衫，然后走了出去。
eg. I put on the pearl earrings Daddy had bought me.
我戴上了爸爸给我买的珍珠耳环。
4. give out
分发；散发；
eg. The teacher gave out the examination papers.
教师发了考卷。
eg. The American seem to give out their invitations so far in advance.
美国人似乎提前许多天就发出请。
5. once in a while
偶尔；间或；
eg. Once in a while we had a major blowout.
我们偶尔会吃顿大餐。
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
