"Nobody knows for sure and certain," said Martha.

“没有人确切知道。”玛莎说。

youdao

Nobody knows for sure whether the theory is true or not, but it's a fact that bees are disappearing in very large numbers.

没有人确切地知道这个理论是否正确，但事实是蜜蜂正在大量消失。

youdao

Nobody knows for sure.

没人确切地知道。

youdao

So that would be my guess, but nobody knows for sure.

这是我的猜测,没人能确定

耶鲁公开课 - 古希腊历史简介课程节选

Nobody knows for sure how Mr Bush's two appointees, Mr Roberts and Samuel Alito, would vote.

ECONOMIST: The Supreme Court

Nobody knows for sure how the federal fiscal crisis might influence future defense spending.

FORBES: How Northrop Grumman Aims To Outperform

But nobody knows for sure how the currency markets would react were the pact to be diluted or even scrapped.

ECONOMIST: Europe's stability pact