1. drop by / in 顺路拜访
（1）I'll drop by on my way home if I have time.
（2）Do drop in if you happen to be passing!
2. due to 欠下债[账]；应给予；由于；定于
（1）The boss gave him the push due to his careless work.
（2）I received nothing except what was due to me.
3. each other 互相
（1）The two pictures are made to lap over each other.
（2）The wrestlers try to seize hold of each other.
4. easier said than done 说起来容易做起来难
（1）But to build a clean car is easier said than done.
（2）This is easier said than done in white light but it's well worth trying.
5. east of 在...东面
（1）To the east of our school, there's a naked hillside.
（2）China lies on the east of the Pacific.