Apropos of what you were just saying .

关于你刚才所说的话.

Apropos what you said yesterday , I think you were right .

关于你昨天所说的话，我想你是对的。

Apropos , do you find the new radio set satisfactory ?

顺便问一声，你对那新的收音机满意吗？

You 'll find the last paragraph extremely apropos .

你会觉得最后一段文字极为中肯。

Apropos your brother , I 'll front him later .

至于你哥哥，我以后再对付他。