示例
A：Mom, can I have Iphone 4?
B：It's pie in the sky. You are so young.
A：妈妈，我想要Iphone 4。
B：不行，你太小了。
A：I want to be as successful as Bill Gates.
B：You? It's pie in the sky.
A：我想和比尔盖茨一样成功。
B：就你？得了吧。