这是一项昂贵的操作，因为可能会移动每个活动对象，每个经过移动的对象的指针都必须更新为新位置。

This is an expensive operation because every live object might be moved, and every pointer to a moved object must be updated to the new location.

youdao

这对函数了解自己的活动记录在什么地方提供了方便——它们可以使用堆栈指针的形式简单地进行定义。

This makes it easy for functions to know where their activation record is — they are simply defined in terms of the stack pointer.

youdao

如果一个函数正在执行，那么堆栈指针就会指向整个堆栈的顶部，这也是该函数活动记录的顶部。

If a function is executing, then the stack pointer is pointing to the top of the whole stack, which is also the top of that function's activation record.

youdao