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1·John was trying to slink into the house by the back door.

约翰想从后门溜进房子里。《牛津词典》

2·I avoided meeting her by leaving by the back door.

我从后门离去以免和她相见。《新英汉大辞典》

3·He entered by the back door.

他从后门进入。

4·He entered by the back door.

他是从后门进来的。

5·He left the house by the back door.

他从房子的后门离开了。

6·The prisoner escaped by the back door.

犯人从后门逃掉了。

7·To avoid them I left by the back door.

我为了避开他们，就从后门走了。

8·Can we get in the house by the back door?

我们可以经过后门进入房子吗？

9·The man entered the room by the back door.

那人通过后门进入了房间。

10·I saw him enter the building by the back door.

我看到他从后门进了大楼。