重点讲解：
1. be sth. to do with sth.
与…有关；关于；
eg. They were shouting at each other. It was something to do with money.
他们在吵架，是为了钱的事。
eg. My new job is something to do with marketing.
我的新工作和市场营销有关。
2. knock out
使不省人事；使入睡；
eg. He was knocked out by a single blow to the head.
他头上只被打了一下便昏过去了。
eg. The police was hit on the head and knocked out.
警察头部被击，晕倒了。
3. laugh at
嘲笑；讥笑；
eg. Don't laugh at unfortunate people.
不要嘲笑不幸的人。
eg. They laughed at my puny efforts at rock-climbing.
他们取笑我在攀岩活动中的那可怜劲儿。.
