Design: Two factor factorial design.
设计：两因素析因设计。
Design: Factorial design was applied.
设计：析因设计。
Now, let's return to the factorial function.
现在，让我们回到阶乘函数上来。
Design Factorial design of two factors.
两因素析因设计。
Design: Factorial design of two factors.
设计：两因素析因设计。
The function would continually call factorial.
函数会连续不断地调用factorial。
Now, in the new call to factorial, num is set to 3.
现在，在新一次调用factorial时，num被设置为3。
The experiment was designed as a factorial experiment.
实验采用析因设计。
The focus is upon the introducing the factorial analysis.
文中介绍了因子分析的计算方法。
This limits greatly the possible range of your factorial function.
这极大地限制了阶乘函数的可能范围。
Even worse, the factorial of 4 is being calculated three times.
更糟糕的是，4的阶乘被计算了三次。
We only use it the first time we call fact, at the end of factorial.
我们只在第一次调用fact的时候需要它，也就是在factorial的最后。
The symbol now has two meanings, the combinatorial and the factorial.
现在符号有两重意义，即组合意义和阶乘意义。
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。
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。
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