(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。