If you have strong and healthy good habits, it doesn't matter whether you fail or not today, because you are sure to succeed in the end.

如果你有强壮健康的好习惯，今天失败与否都不重要，因为你最终一定会成功。

youdao

I'm not sure—I can find out for definite if you like.

我没把握—如果你愿意我可以去核实。

《牛津词典》

After all, if it's true that what goes around comes around, why not make sure that what's circulating around you is the good stuff?

毕竟，如果“善有善报，恶有恶报”是真的，那为什么不确保你周围的都是好的事情呢？

youdao

But if the person who won your heart does not love you, then you are sure to have a broken heart.

VOA: special.2010.07.18

I'm not sure if the Yale Library has this or not, but if they don't you could ask the librarian to get it.

我不太确定耶鲁的图书馆是否有这本书,但是如果他们没有,你们可以要求图书管理员购置

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

You want to... you're not sure if you're going to read something that's related to literature, or to science,

你想要……你不确定是读点跟文学相关的还是读点跟科学相关的内容。

How many课堂 - SpeakingMax英语口语达人

If you are not sure whether you can access the internet on your device, check with your mobile network provider.

BBC: News on your mobile

If you're not sure you're ready to make a lengthy time commitment, the Peace Corps gives you decide.

CNN: Site Seer: Help others in need, and help yourself

If you are not sure and have the guts for it, issue a survey to co-workers and your hired resources.

FORBES: 5 Tips To Take Charge Of Your Career Learned From Startups