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1·He was uncertain about his brother's intentions.

他对他兄弟的意图心中无数。《柯林斯英汉双解大词典》

2·In spite of all that has been said, quite a lot of people are still uncertain about the prices of housing in China.

尽管已经说了很多，有很多人对于中国的房价仍然不敢确定。

3·But many young researchers, especially those who have not been mentored in open science, are uncertain about whether to share or to stay private.

但许多年轻的研究人员，尤其是那些没有接受过开放科学指导的人，对于该分享还是保持隐私是不确定的。

4·They're both uncertain about what to do.

他们两人都拿不定主意该怎么办。《牛津词典》

5·Millie asks Andy to fix her broken bicycle, however, he is uncertain about it.

米莉请安迪修理她那辆坏了的自行车，然而，他对此并不确定。

6·Scientists continue to study identical twins because they are uncertain about them and have many questions.

科学家们继续研究同卵双胞胎，因为还有不确定的地方和许多问题没解决。

7·Many young researchers, especially those who have not been mentored in open science, are uncertain about whether to share or to stay private.

许多年轻的研究人员，尤其是那些没有接受过开放科学指导的人，并不确定到底是该分享还是保密。

8·For example, a company may be able to estimate accurately the aggregate number of shoes it will sell, but it may be uncertain about which specific types of shoes will sell more than other types.

例如，一个公司也许能够准确地估计它将销售的鞋子总数，但它可能不确定哪一种特定类型的鞋子将比其他类型的鞋子卖得更多。

9·I was uncertain about what to do next.

我确定不了接下来做什么。

10·I am uncertain about grammar and some idioms.

我对语法及一些习语把握不大。