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

约翰想从后门溜进房子里。

He used his friends to help him get into the civil service by the back door.

他利用朋友帮他开后门当上了公务员。

The government would not allow anyone to sneak in by the back door and seize power by force.

政府不允许任何人用不正当的手段混进来，然后通过武力夺权。

I avoided meeting her by leaving by the back door.

我从后门离去以免和她相见。

He entered by the back door.

他从后门进入。