Drop off 放…下来

　　Could you please drop me off at the train station?

　　能在火车站放我下来吗？

　　Drop out 辍学

　　He dropped out of school when he was 3 because he has a rich dad.

　　他爸很有钱，所以他3岁的时候辍学了。

　　drop by 拜访，看望

　　I'll drop by later.

　　我一会来看你。

　　a drop in the ocean 杯水车薪

　　1000 is like a drop in the ocean in the stock market.

　　一千块在股市里就是杯水车薪。