你得到这样的机会，可不是常有的事。

It is not often that you get such an opportunity.

《牛津词典》

小孩尿床是常有的事。

It is quite common for small children to wet their beds.

《牛津词典》

其他不常有的便利设施包括一个图书馆和健身房。

Other amenities, less commonly available, include a library and exercise room.

《柯林斯英汉双解大词典》

So this one is so uniquely pervasive, let's just really explicitly write it all out.

所以这个是非常有说服力的，我们把它写下来，考虑某个过程以及。

麻省理工公开课 - 热力学与动力学课程节选

So there's a return branch on every possible path through the code. And that's valuable, it's something you want to think about as your right your own.

所以代码中每条可能的路径,都会有一个返回值分支，这是非常有价值的,当你自己写程序的时候也应该考虑这件事。

麻省理工公开课 - 计算机科学及编程导论课程节选

There's a reason we like sugar, and there's a real reason when we like the two of them together in something like ice cream.

我们喜欢糖也是有原因的,我们喜欢二者兼备的食物,比如像是冰淇淋,是非常有道理的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选