重点讲解：
1. creep in
不知不觉地发生；
eg. Insecurity might creep in.
可能会不知不觉地产生不安全感。
eg. Once complications are allowed to creep in, the outcome is in danger.
要是不慎出现了并发症，那么后果是危险的。
2. go on
进行；发生；
eg. While this conversation was going on, I was listening with earnest attention...
这场对话进行的时候，我聚精会神地听着。
eg. I don't know what's going on.
我不知道发生了什么事。
3. knock out
使不省人事；使入睡；
eg. The three drinks knocked him out.
3杯酒就让他昏昏入睡了。
eg. He had never been knocked out in a professional fight.
在职业拳击赛中，他从未被击倒判败过。
4. have an appointment with
约定；约会；
eg. She has an appointment with her accountant.
她和她的会计约好了见面。
eg. I have an appointment with my dentist this afternoon.
我已约好今天下午去看牙医。