If you want to be certain of getting a ticket, book now.

要想有把握买到票，现在就得预订。

《牛津词典》

What Descartes has done is find at least one thing that he can be certain of.

笛卡尔所做的就是找到了至少一件他能确定的事。

youdao

But nobody can be certain of the outcome.

但是，谁也不确定这就是结局。

youdao

Being a patient in certain hospitals in the month of July can be dangerous or even deadly.

VOA: special.2010.06.16

And...so those issues added up is a democratic context which you can't be certain of what the policies will be, so all of these make it sort of somewhat trickier than a place like China.

所以，所有因素加起来,就造成了投资者的困惑,你无法确定,下一秒会出台什么政策,这就使得在印度投资比在中国,这样的国家来说棘手多了。

普林斯顿公开课 - 国际座谈会课程节选

That is to say, theory has certain ambitions to a totalization of what can be thought that resembles or rivals philosophy.

也就是说，理论探讨的问题,与哲学相似或相媲美,而且倾向于把它完整化。

耶鲁公开课 - 文学理论导论课程节选

In practice only three can be certain of an invitation: Poland, the Czech Republic and Hungary.

ECONOMIST: Enlarging too far, too fast, could bust the alliance

But the opposition cannot yet be certain of winning a vote on the presidency.

ECONOMIST: Peru

Unlike with bonds (that do not default), preferred holders cannot be certain of getting their principal back.

FORBES: Do Preferred Stocks Deserve a Place in Your Portfolio?