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。

哈佛公开课 - 计算机科学课程节选

It's just some random chunk of four bytes that happens to be available at this point in time, but I can put something there.

只是一些随机的四字节的内存块,在这里是可以使用的，但是我可以在那里放置东西。

哈佛公开课 - 计算机科学课程节选