be sure of

He likes to be sure of his bodily comforts.

注重物质上的舒适。

In that way one is sure of accepting no humbug.

如是一至被骗。

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

她扭头看了看后面以确认自已是否站稳了。

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

确信自己时，我少怕斗争。

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

"那次试容易,题目的答案我全都有把握。"

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

在你提供实质性的证据时,你须确知它的来。

He is sure of himself.

自信。