Speak of the devil
说曹操曹操到
本句是一句非常老的古话，但仍是非常有用的话。在讲话中提到某人的时候，该人正好出现，这时就可以用Speak of the devil来欢迎他的出现，这比单纯的How are you?或It's you 要好多了。

对话一：
A:Look,who's here?
嗨,看看谁来了。

B:It's Tom.
是汤姆。

A:Well,speak of the devil.
是啊，说曹操曹操到。

B：We were just talking about him.
我们正好谈到他。

A:That's quite a coincidence.
这可真是个巧合。

B:It sure is.
是啊，真是巧。

对话二：
A:Well,speak of the devil.
哇，真是说曹操曹操到。

B:What do you mean?
为什么这样说。

A:I was just think about him the other day.
我日前才刚刚想起你的。

B:You were?
真的?

eg:
We were just talking about him.

我们正好谈到他。

We were just discussing the issue.
我们刚刚真在讨论这个问题。

词汇大总结：
devil 魔鬼，人
coincidence 巧合
mean 意思
the other day 前些日子