是不是挺有意思的？不管哪种解释是正确的，现在mind one's p's and q's常用来表示“注意自己的言行”(to be polite or careful in one’s behavior)。
再来看个例句：
You'd better mind your p's and q's if you want to be invited again!
你如果希望下回还被邀请，最好注意一下自己的言行。
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