This includes the definition of global variables and functions.

它包含全局变量和函数的定义。

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Conservative binding semantics exist for global variables as they do for functions and data types whenever necessary.

在对函数和数据类型使用全局变量时，必要时可以使用保守的绑定语义。

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Functions can be defined within another function and assigned to global variables or returned as results.

函数可在另一个函数内定义，还可赋给全局变量或作为结果返回。

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So, conceptually if you've ever wondered why you get access in all of your functions to global variables that's because they're not down here, they're at the very top of RAM and any function can access that RAM way up there, but for now the interesting player in the story is this thing called the heap.

所以，如果你想知道为什么全局变量能在,所有的函数中使用,那是因为它们不在这下面，而是在内存的顶端,那样任意函数都可以在内存中使用它们，现在，这里面一个有用的角色是,叫做堆的东西。

哈佛公开课 - 计算机科学课程节选