医生称，口罩可以阻挡高达80%的病毒，但如果不勤洗手，戴口罩也没有用。

Some doctors say that masks can stop the virus as much as 80%, but if you don't wash your hands often, it's no use wearing a mask.

youdao

很多人都认为带着孩子不可能成为自行车上班族，但如果不这么想，这件事确实很简单。

Many people think it’s impossible to be a bike commuter with children, but that is simply not the case.

youdao

有一些SATA控制器允许对主机板进行扩展，但如果不事先做好准备的话，可能会带来一些麻烦。

There are some SATA controllers that allow expansion of the motherboard, but may create a bottleneck if not planned for in advance.

youdao

It's very exciting, but if you think you know everything you don't need to learn, you don't belong to us. I always need to learn.

这很令人兴奋，但如果你认为,你什么知道，你不需要学习了，那么请你退出百度，因为人总是在学习。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

I have it on reserve, but that's not required for the mid-term; it's just if you're interested in seeing it.

我将其列为推荐书目,但不作为期中考试要求,如果你们感兴趣的话可以去读一下

耶鲁公开课 - 金融市场课程节选

All right? If I'm gambling, I'm saying, gee, if I'm really lucky, it'll be only on this side, and I've got a little bit of work to do, but if I'm unlucky, I'm scrawed, the past pluperfect of screwed, OK., or a Boston fish.

如果我够幸运的话，目标数就会在这边的，这会大大减少我的工作量，但如果不幸运呢？我就完蛋了，我就得再从剩下的这么大的数组里找了，这很痛苦，因此选中位数是正确答案。

麻省理工公开课 - 计算机科学及编程导论课程节选