be certain of

It is usually not possible to be certain of the history of a second-hand child seat.

它通常是不可能的某些历史的一个二手儿童座椅。

And remember, you don't need a certain number of friends, just a number of friends you can be certain of.

请记住，你不需要一定数量的朋友，只要有一些你可以确定的朋友就够了。

I don't need a certain number of friends, just a number of friends I can be certain of.

我不需要朋友达到一定数量，我只需要很多我信得过的朋友。

Similarly the principles on which your life is based may be entirely sound, but until you've examined them, you can't be certain of this.

与此相似，作为你的生活基础的那些原则，或许完全是说得过去的；但是，在你细究之前，你对此是拿不准的。

Whatever uncertainties the last few weeks may have brought I want you to be certain of this our work together will continue unchanged.

无论过去的几周我们多么不开心，有一点我希望是肯定的，那就是我们一定要坚持不变地在一起继续工作。

BACK in the 1980s, marketers could be certain of reaching 90% of American households with an advertisement on prime-time network television.

回顾上世纪八十年代，市场营销人员只需要在电视网黄金时间投放广告便可以确保对美国家庭的送达率达到90%。

To do this, the designer must be certain of the actual path that the return current takes in getting back to the signal source.

要做到这一点，设计者必须掌握电流的实际流向和返回信号源的路径。

As yet, she cannot even be certain of the degree of her own regard nor of its reasonableness.

迄今为止，她甚至都无法确定自己对他关注的程度是否妥当。

By staying indoors, they might miss out on some great skiing, but they can be certain of avoiding burial in an avalanche.

如只呆在室内，也许他们错过了一些美炒的滑雪过程，但他们能肯定能避免埋葬在雪崩中。

There is only one corner of the universe you can be certain of improving and that's you own self !

宇宙中只有一芥之地是你肯定可以改善的，那就是你自己！

If you want to be certain of seeing a play in London, you have to book your seat in advance.

在伦敦，如果你想确保自己能看上一场戏剧，那么你必须提前订票。

More pregnant women receive a first-trimester ultrasound exam, the only way to be certain of the fetus' exact age.

更多怀孕妇女要接受三个月一次的超音波检测，唯一办法就是确认胚胎的确切年纪。

As with anything involving North Korea and its reclusive leader, it's difficult to be certain of the details of the speech.

正如任何与朝鲜及其离群索居的领导人有关的事一样，很难确定讲话的细节。

Journalists must be certain of their evidence, as an accusation of fraud could leave someone's career in ruins.

记者必须对他们的证据非常确定，因为一次科研造假的指控可能毁掉一个人一生从事的事业。

I can be certain of my own thinking the skeptics cannot destroy that.

我能感知到自身关于怀疑论的想法并不会被打垮。

There is only corner the universe you can be certain of improving, and that's your own self.

在天地万物间，你所能改进的只有一个角落，那就是你自身。

"The only thing we can be certain of in silver right now is that the roller coaster journey is going to continue for some time, " UBS said.

“就白银来说，目前我们可以肯定的是，动荡走势将持续一段时间。”瑞银称。

I can't be certain of what time I left the office.

我不能肯定我是什么时候离开办公室的。

To be certain of a place, we started attending the local Anglican church when Robert was about two.

为了确定能被录取，我们在Robert两岁时开始参加当地的国教教会。

They were more likely to be certain of the number of lovers they had had.

她们对性伴侣的数量一般更确定。