So that's the second thing I've just highlighted here, is that I now have the ability to check whether it does the right thing.

你知道的，一个虚数,但是返回虚数就没有什么价值了,那么这是我想要强调的第二件事情。

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If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.

如果这当中有一个负数,乘积就会变成负的,如果你对一个负数开根号,你就会得到一个虚数

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