then again

另一方面, 还有, 反之, 否则

例句与用法：

I thought you told me about the fire, but then again it could have been Bill.

我想是你对我讲的那场火灾，要不就是比尔。

He's clumsy and untidy but then again he's always willing to help.

他笨手笨脚的又邋遢; 可是话说回来，他总是乐於助人。