And, that's equal to the product of e the proton number times e.

正等价于,质子数乘以。

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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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n So the velocity is given by this product of the quantum number n Planck constant 2 pi mass of the electron time the radius of the orbit, which itself is a function of n.

速度是量子数,普朗克常数2π乘以轨道半径的值,它自身也是n的函数。

麻省理工公开课 - 固态化学导论课程节选

If when x is low, y also tends to be low, then this will be negative number and so will this, so their product is positive.

如果x取值小,同时y值也小,这将是一个负值,这个也是负值,负负得正,结果是正值

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