If you try to call fact outside of factorial, you will get a compiler error.
如果你尝试在factorial之外去调用fact，你会得到一个编译错误。
In fact, the second type of error control is also essential.
其实，对于第二类错误的控制也是十分必要的。
The result of analysis has little error, and accords with fact.
分析结果误差较小，与现场实际相符。
The result of analysis has little error, and accords with fact.
分析结果误差较小，与现场实际相符。
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