它几次尝试爬出来，但一直失败。

He tried to escape many times, but always in vain.

youdao

我使用过它几次“改进”示例中，只需以便无法看到它。

I've used it a couple of times in the "improved" example, just so you could see it.

youdao

虽然在地质记录中有十几次甚至更多的大灭绝，但白垩纪的大灭绝总是引起古生物学家的兴趣，因为它标志着恐龙时代的结束。

While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs.

youdao

So, if there is one section of the lecture that I went a little too quickly for, you could say, gee, if I could just see that five minutes, you could click on it, zoom into that five minutes, play it a few times, and then say, I still don't know what he's talking about.

所以，如果有那节课,我上得过快，你可以说，天啊，我多希望我能看到那5分钟，你就能点击它，选择那五分钟，播放几次，然后说，我还是不知道他在说什么。

麻省理工公开课 - 固态化学导论课程节选