主平方根函数是使用非正实轴作为分支切割定义的。
The principal square root function is defined using the nonpositive real axis as a branch cut.
这个让你知道怎样寻找平方根。
另外,计算平方根。
And the fourth thing to notice is, I've used abstraction. I've said nothing about how I'm going to make square root.
第四件事情就是,我运用了抽象,我对怎么去求平方根没有提及。
What is that? It's the piece of code we wrote for computing square roots, square roots of actually perfect squares.
对吧?这是什么呢?,这是我们写的计算平方根的代码,计算完全全平方根的。
But he said the energy of an X-Y bond is going to be equal to the square root.
但他说XY键的键能,会等于XX键与YY键键能乘积的平方根。
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