Because you don 't know.

因为，你不知道。

youdao

Don 't wait... Because you don't know how long it will take.

不要等待，因为，你不知道等待需要花费多少的时间。

youdao

Not because it "s impossible, or too hard. It" s because you don "t have the attitude it takes."

不是因为那是不可能的，或者太艰难，只因为你没有它所需要的心态。

youdao

And one day you want to go to the cemetery or something, you can't do it because you don't know where they are.

VOA: special.2010.02.01

One is simple disbelief or unbelief a kind of rejection of ruling opinion simply because you don't like it.

其一为，就只是不相信或是无信仰,即拒绝统治主张,理由仅是你不喜欢它。

耶鲁公开课 - 政治哲学导论课程节选

It's a bit more ethical because you don't have to worry about all the pollution

这样做很符合社会公德，因为你不用担心会产生污染，

地铁的好处 - SpeakingMax英语口语达人

You know when somebody says that that it's not even injury because you don't say that.

BBC: Enniskillen survivors reflect on the bombing 25 years on

But what if you still don't want to vote because you don't think it will work?

BBC: Will you vote for the police and crime commissioners?

It's a sort of phoney suspense really, because you don't really believe in it.

BBC: The Gathering Storm