(一).Don't give up too easily.不要轻易放弃。

原音重现：

A: I think this project is going to be a failure.

我觉得这个项目会失败。

B: Don't give up too easily. It might be successful.

别轻易放弃，说不定会成功呢。

(二).You never know.难说啊。/不知道。/谁知道呢?

原音重现：

A: They tell me Paul may become president.

他们都说保罗会当老板。

B: You never know. He is very popular.

谁知道呢?他人气是挺旺的。