A counter is great but how do I write a real system?
一个计数器不错，可我如何写一个真正的系统呢？
This is not a system you would like to have in a real application, but it will let me move on.
这不像实际应用中的应用程序，目的为了继续执行。
This is not a system you would like to have in a real application, but it will let me move on.
这不像实际应用中的应用程序，目的为了继续执行。
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