现在，在波尔兹曼方程方程里，我们要追踪中子，所以我们需要，能将流量拿出并除以速率。

Now in the Boltzmann Equation we wanna track neutrons so we need to take the flux and divide it by the velocity.

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我们已经使用了一个相对简单的词语，称为，中子的增殖系数，那就是K，如果K等于1，中子数，是稳定的，裂变速率也一样。

And we've used a relatively simplistic term called neutron Multiplication Factor which is the K that if the K equals one the neutron population is steady as is the fission rate.

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中子星的速率,得到轨道的半径，得到周期的大小，如之前讨论过的那样，现在取一个光学的。

That means you can get the speed of the neutron star, you can get the radius of the orbit, and you can get the period, just like we discussed before.

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