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Let me hazard a wild guess: the system of passwords you use on the internet – for accessing online banking, email, shopping sites, Twitter and Facebook accounts – is a mess. 让我大胆猜测一下：你在互联网上使用的，用于访问网上银行、电子邮件、购物网站、Twitter和Facebook账户的密码系统是一团糟。 You know perfectly well what you ought to be doing: for each site you visit, you should be choosing a different, complex sequence of letters, numbers and symbols, and then memorising it. (That's rule number one of the conventional wisdom on passwords: never, ever write them down.) But you don't do this, because you weren't blessed with a brain that's capable of such feats. 你完全知道自己应该怎么做：你所访问的每个网站，你都应该选择一个由字母、数字和符号组成的不同且复杂的序列，然后记住它。（这是关于密码常规智慧的第一原则：永远不要把它们写下来。）但你不会这样做，因为你无福拥有具备此类技能的大脑。 So instead you use the same familiar words for every site – your dog's name, the name of your street – with occasional ingenious permutations, such as adding "123" at the end. Or maybe you do try to follow the rules, in which case you're probably constantly getting locked out of your bank account or trying to remember the answers to various absurd security questions. ("What was your favourite sport as a child?") And things are getting worse: these days, you find yourself forced to choose passwords with both upper- and lower-case letters, and what normal human being can remember multiple combinations of those? Not you, that's for sure. | 
