替换它们可能会是一项艰巨、复杂且代价高昂的任务，这就是如果它们表现良好就不要改动它们的原因所在。

They can be big, complex, and expensive to replace. All of these are good reasons to leave them alone when they are working fine as they are.

youdao

有代码注释和浏览，有生成小代码段和执行复杂的查找替换操作。一切在你写代码时需要了解的事情都可以在这一章里找到。

From code comments and code navigation to generating code snippets and performing complex find-and-replace searches, this chapter covers all you need to know while you write code.

youdao

这只是一个，为了不让你们迷茫的例子，以前我们也学过，怎样在更复杂的坐标系中替换变量。

I should say this is an example, in case you were wondering what I was doing. We have also actually seen how to change variables to more complicated coordinate systems.

youdao