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1·He had to be certain. There could be no room for doubt.

他必须确定无误。不能有任何的犹疑。《牛津词典》

2·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》

3·She would break my biscuits in half to be certain I wouldn't choke.

她会把我的饼干掰成两半，以确保我不会噎着。

4·To be certain that Rollie was talented, Mr. Ross ran a bright chimp through the same process and compared the results.

罗斯先生为了确认罗妮的确聪明，他对一只聪明的黑猩猩进行了相同的研究，并比较了研究结果。

5·The third, and most potent limitation is that it is not possible to be certain that the infant's response was due to the stimulus presented or to a change from no stimulus to a stimulus.

第三也是最有力的限制在于婴儿做出的是面对刺激的反应，还是从受到刺激到没受到刺激的变化，这是无法确认的。

6·China needs to be certain of having a nuclear second strike.

中国需明确无疑地拥有二次核打击能力。

7·The seasons used to be certain and we would know when to plant crops.

以往的季节很确定，我们知道什么时候该种庄稼。

8·n this world nothing can be said to be certain, except death and taxes.

除了死亡和税收之外，这个世界上没有什么是必然的。

9·Whatever you think you know to be certain is probably a lot more flexible than you think.

你经过思考而得到的结论，切忌那么的肯定，任何事情都比你想象的更有弹性。

10·to be certain the sun will shine, but grab an umbrella on our way out — just in case.

确定阳光会很灿烂，出门还是带把雨伞——只是以防万一。