One should never criticize if one is not sure of one's facts.

一个人如果对自己掌握的事实没有把握，就绝不该随便批评。

《牛津词典》

The timetable for trains is so tight that if one is a bit late, the domino effect is enormous.

列车时刻表安排得很紧凑，所以，如果一列火车晚点一会儿，就会引起巨大的多米诺效应。

《柯林斯英汉双解大词典》

With nine engines on the first stage, Falcon 9 can reach orbit even if one or more fails.

猎鹰9号的第一级有9个引擎，即使一个或多个引擎故障，它仍然可以到达预定轨道。

youdao

And if one person dies, the other person may have a difficult time claiming the couple's money or property.

VOA: special.2011.05.23

Well, it's on one hand a very large idea to take in, particularly I think if one's working in a university.

这是一个很大的话题，不容易理解，对于在大学中工作学习的人尤为如此。

普林斯顿公开课 - 人性课程节选

But frankly, I'm convinced, insofar as I'm convinced of anything, that if one doesn't live by that, nothing of any interest is going to happen.

不过，坦率来讲，我相信，或者说，我确信，如果一个人不相信这一点，那么他的艺术创作只会平淡无奇。

普林斯顿公开课 - 人性课程节选

But how would Compaq survive if one of five of the computers it brought to the marketplace succeeded?

FORBES: A hail of silver bullets

If one of the plaques in your coronary arteries ruptures, it can cause a heart attack.

CNN: Acute coronary syndrome

If one of them, the English one is also reversed, or not, it gets quite confusing.

FORBES: Does Japan's LDP Have a Winner in Former PM Abe? I am Betting on Noda.