我们有疏忽的一些时候。

There were occasions when we slipped up.

《柯林斯英汉双解大词典》

但过去也有过一些时候，雨季的雨水浸透了这片“空白之地”，把它从沙漠变成点缀着湖泊的草原，成为各种动物的家园。

But there've been times in the past when monsoon rains soaked the Empty Quarter and turned it from a desert into grassland that was dotted with lakes and home to various animals.

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过了一些时候，车停了。

After some time, the bus stopped.

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That is to say that when we think we're telling the truth we're actually using worn-out figures of speech.

也就是说我们认为我们在讲述真理的时候,我们实际上却在使用一些陈腐的修辞手法。

耶鲁公开课 - 文学理论导论课程节选

Some of the schools that they rate and say that kids are not learning and the tests are too easy.

他们评价一些学校的时候，发现孩子们没有学习，并且考试太容易了。

哈莱姆的变迁 - SpeakingMax英语口语达人

So this project was, let's see if we can detect any alpha particles by making a detector that swings around.

当你是本科生的时候，你们的导师会派一些,你们看上去很傻的工作,给你们干，现在这个工作就是。

麻省理工公开课 - 化学原理课程节选