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

But... I really like the student center because there's a lot of places you can eat in there,

但是……我真的很喜欢学生中心，因为那里有很多可以吃东西的地方，

因为体育而亲近 - SpeakingMax英语口语达人

I can certainly try to write the number 13 there, but bam, my program very likely will crash if this chunk of memory was not given to me previously by the operating system and maybe it is owned by the operating system.

我当然可以在那里写下数字13，但是“嘣“,如果这块内存不是系统预先给我的,我的程序很可能会崩溃,可能这块内存,是系统本身使用的。

哈佛公开课 - 计算机科学课程节选