该函数简单检查地址可能是在用户空间，而不是内核。

This function simply checks that the address is likely in user space, not in the kernel.

youdao

验证并不会告知关于文档所需了解的一切，但它却使编写大量简单检查变得很简单。

Validation will rarely tell you everything you need to know about a document, but it makes it easy to write a lot of simple checks.

youdao

生活远比简单检查完成你任务表来的更为复杂，少于100%的高效能并不是犯罪。

Life is about so much more than simply checking off everything on your to-do list - and being less than 100% productive is no crime.

youdao

Now, what did I want to do? I wanted to check membership. I want to do search. Well that's simple. Given that representation and some value, I just say gee is it there?

现在，我需要做什么？,我要做成员检查，我要做查找,这就很简单了，给了即定的表示和一些值,我只需要说喂在那儿吗？

麻省理工公开课 - 计算机科学及编程导论课程节选

And so can we do a little sanity check with the simple case here?

对这个简单的例子我们能不能做完整性检查呢？

哈佛公开课 - 计算机科学课程节选

But that merging process only takes N steps, N*log N so that's N times log of N. Now, it's a little tricky to reason through this perhaps the first time, let's just take a very simple example and see if we can do a little sanity check here.

但这个合并过程只需要N步，所以时间复杂度是,第一次对此进行推论可能会有点儿棘手，我们举一个简单的例子,看看我们能否做一些完整性的检查。

哈佛公开课 - 计算机科学课程节选