It is certain that two and two makes four.

The symptoms may be exacerbated by certain drugs.

这些症状可能会因为某些药物而加重。

I was no sooner certain of this than I began to feel sick, faint, and terrified.

我刚确定他已经死了,便立刻感到恶心 、 头晕 、 恐惧.

He got up at six so as to make certain of being in time.

他六时起床以确保准时.

" Why, Aleck, I could do it and not be found out -- I'm certain of it. "

“ 嗨, 艾莱柯, 我能做得神不知鬼不觉 —— 我保证. ”

He philosophized, he admitted, not because he was certain of establishing the truth, but because it gave him pleasure.

他承认自己高谈阔论不是因为他确定找到了真理，而是因为那给了他很多乐趣。

I'm quite certain of it-she looks so malicious.

我相信一定是的 —— 她的样子显得那样恶毒.

She is a confident woman who is certain of her views.

她是一位充满自信的女性，对自己的观点深信不疑。

This letter made me certain of his innocence.

这封信使我相信他是无罪的.

We are certain of success.

我们确信会成功.

If only they wanted to buy, Mr. Lin's shop was certain of trade.

只要他们存心买, 林先生的营业是有把握的.

He felt quite certain of success.

他对成功很有把握.

I'm certainly not scared of him.

我当然不怕他。

I should certainly be on my guard if I were you.

我要是你肯定会保持警惕.

He's certainly got the right idea, retiring at 55.

他真的想通了, 打算55岁就退休.

She's certainly not great shakes as a mother.

她当然只是一个普普通通的母亲.

I certainly don't remember talking to you at all.

我当然完全不记得和你讲过话。

Japanese democracy is certainly different from ours.

日本的民主制度无疑与我们的不同。

He is certainly a good salesclerk.

他确实是个能干的店员.

He is certainly being smiled on by fortune.

现在他一定是得到了命运的垂青。

My audience certainly isn't the proverbial man in the street.

我的观众当然不是街上的平头百姓。