What is not certain is whether we should follow, or be suspicious of, what our bodies are telling us.

不确定的是，我们是否应该遵循或怀疑我们的身体告诉我们的东西。

youdao

I'm not certain who was there.

我无法确定谁当时在场。

《牛津词典》

The company's financial position is not certain.

这家公司的财务状况不明朗。

《牛津词典》

After narrowly passing the House Friday, the bill goes to the Senate, where its fate is not certain.

VOA: standard.2009.06.27

I'm not certain it's meaningful, unless you are in the habit of giving your furniture personal names.

我不确定它有意义，除非你们热衷于,给你们的家具起名字。

麻省理工公开课 - 计算机科学及编程导论课程节选

Either that you are certain of something, that you are not certain of something,

一种是表达你对某件事情很有把握或者并没有什么把握，

I'm sure 课堂 - SpeakingMax英语口语达人

But, she writes, it's not certain if that's how people will use the network.

CNN: John D. Sutter,

It is not certain Obama will win the presidency, though the odds favor him.

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Israel is not certain whether Egypt will also launch missiles into Israel via the Sinai peninsula.

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