史密斯先生用英文表达是：Mr. Smith；

Mr：abbr. (用于男子的姓氏或姓名前)先生; (称呼要员)先生。

Smith：n. 史密斯。

How long has Mr. Smith been in China?

史密斯先生在中国多久了?

What a kind man Mr. Smith is!

史密斯先生可真是个好人啊！

B: That's true. Could you tell Mr. Smith I'm sick?

B：没错。你能告诉史密斯先生我病了吗?

With a candle in his hand, Mr. Smith answered the door.

史密斯先生回应了敲门声，手里举着蜡烛。

Mr. Smith handed Mum the box, "I believe this is yours."

史密斯先生把盒子递给妈妈：“我想这是你的。”