Speak of the devil. 说曹操，曹操到

speak of 说起，说到，谈及

devil 魔鬼

Speaking of money, you still owe me 50 bucks.说到钱，你还欠我50美元呢。

--Did you know that Becky dumped her boyfriend for a very rich old man?

你知道吗，Becky 为了一个有钱的老男人把她男朋友甩了。

-- Speak of the devil, there they are.说曹操，曹操到，他们在那呢。