Mary can't understand :
"She is blue today."
"You are yellow."
"He has a green thumb (大拇指)."
"He tells a white lie."
And she goes to her teacher for help.
Mary: Mrs. Smith, there is a colour in each of these sentences. What do they mean?
Mrs. Smith: In everyday English, blue sometimes means sad. Yellow, afraid. A person with a green thumb grows plants well. And a white lie is not a bad one.
Mary: Would you please give me an example of a white lie?
Mrs. Smith: Certainly. Now I give you some cake. In fact, you don't like it. But you won't say it. Instead(相反地), you say, " No, thanks. I'm not hungry." That's a white lie.
Mary: Oh, I see. Thank you very much.