it turns out, that this will be a bug, and I want you to think about why it's wrong for me to put this check here.
结果表明我们这儿有一个漏洞,我希望你们去想一想为什么,我把这个check放在这儿就出现漏洞了。
麻省理工公开课 - 计算机科学及编程导论课程节选
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