這是我在看一篇關於C語言的文章時
在Virtual Memory時看到一段話
還蠻好玩的
可以看看

If it's there and you can see it—it's real
If it's not there and you can see it—it's virtual
If it's there and you can't see it—it's transparent
If it's not there and you can't see it—you erased it!
—IBM poster explaining virtual memory, circa 1978
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