I have no idea what's here at the moment so I'm just going to draw a question mark because that memory might have been used previously for some other purpose, but we know it's currently available to us so we have four bytes of memory.

我不知道在此刻这里是什么,所以我画一个问号，因为那块内存可能在之前,为其它的目的而使用过，但是我们知道它可以为我们所使用,这样我们就有4个字节的内存。

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Again, for those-- for whom this is blocked, I'm just dividing the rectangle into smaller squares which is to say that memory is addressable.

这是一整块的，我只是把它划分成一个个小区域,每个小区域都可以设定一个地址。

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You just forget where the memory is that you asked for on the heap and it's not going to get cleaned up on the stack because malloc puts it somewhere else.

你忘了你在堆中申请的内存在哪里,它将会被栈清除,因为malloc把它放在别的地方。

哈佛公开课 - 计算机科学课程节选