be sure of

He likes to be sure of his bodily comforts.

他注重物质上的舒适。

In that way one is sure of accepting no humbug.

如是一人必不至被骗。

She looked over her shoulder to be sure of her footing.

她扭头了以确认自已是否站稳了。

The examination was a pushover; I'm sure of all the answers.

"那次考试很容易,题目的答案我都有把握。"

I rarely flinch from a fight when I'm sure of myself.

确信自己，我很少怕斗争。

When you adduce evidence of this nature, you must be sure of your sources.

在你提供实质性的,你必须确知它的来源。

He is sure of himself.

他很自信。