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1·People may not be sure about life on Mars until a sample of life is brought back.

人们可能不确定火星上是否有生命，直到一个生命样本被带了回来。

2·I'm sorry, but I can't be sure about that.

不能保证会是这么个结果…但我会尽力做。

3·Be sure about the purpose of writing the feature story.

确定好写特写的目的。

4·That is scary, and we cannot be sure about changes in the future.

这是可怕的，因为我们无法确定未来会发生什么变化。

5·The business stakeholders will not be sure about some requirements.

业务利益干系人将无法确定某些要求。

6·Know your objectives, and be sure about what you're hoping to achieve.

知道自己的目标，并确定您希望得到什么。

7·No one can be sure about the future but it definitely is a bright possibility.

没有人可以肯定未来，但它肯定是光明的可能性。

8·The researchers point out that there are many things they cannot be sure about.

研究人员指出，有很多事情是他们无法确定的。

9·Before you buy any wireless equipment, you need to be sure about what you're doing.

之前，你买任何无线设备，你必须要知道你在做什么。

10·But Professor Bedau says that nobody can be sure about the results of making new forms of life.

但是Bedau教授说没有人对制造新型生命的后果打保票。