如果系统中只有客户端代码运行，这不是个问题——但是当系统在一分钟内处理成千上万条单个客户端的请求时，麻烦很快就来了。
Not a problem if the client code is the only thing happening on the system – but it quickly leads to trouble when the system is dealing with thousands of separate client requests a minute.
但是，当你试图搞清楚你的客户想要的是什么的时候，问题就来了。
The problem arrises when you are trying to think about what you customers could want.
但是仔细想一想，问题就来了，螺母一定要做成六角形的原因是什么呢？
But thinks carefully, the question has come, what can the nut certainly make the hexagon the reason is?
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