So CMU allows 32 possible symbols, but as you can see, there's only a small number that most people are using, so we're not actually getting very much strength from the symbols in our passwords.
卡内基梅隆大学允许使用32个符号， 但事实上只有少数几个符号 被大多数人使用 因此，事实上 使用符号并没有让我们的密码变得更加安全