Whether or not we're successful, we can be sure that we did our best.

不管成功与否，我们确已尽了最大努力。

《牛津词典》

And if you keep your curtains closed, burglars are less likely to try and break in because they can't be sure whether someone's home or not.

如果你把窗帘拉上，窃贼就不太可能试图破门而入，因为他们无法确定是否有人在家。

youdao

You'd better reckon without me, as I am not sure whether I shall be able to be present.

你最好别把我算进去，因为我能否出席还不一定。

《新英汉大辞典》

The president says experts are not sure whether swine flu will be more severe than more common seasonal flus.

VOA: standard.2009.05.01

I might not be sure whether the opponent, whether my opponent, is choosing Left or Right.

我可能不太确定,我的对手会选择左还是右

耶鲁公开课 - 博弈论课程节选

I'm not sure whether this really should be called a coma.

我不确定这是否真的该被称作昏迷。

耶鲁公开课 - 死亡课程节选

We're not sure whether the verdict will be decided by the military and imposed on the judges.

NPR: Standoff Develops in Turkey Over Moderate Islamist

I'm not too sure whether the market will be willing to lend more to Indonesia at the moment.

CNN: Money & Investing

"We weren't really sure whether the fog would be there or not, " he explained.

BBC: SPORT | Cricket | England | Dhoni defends delayed declaration