因此我想告诉你们，一些关于开普勒第二定律的知识。
So, I want to tell you a bit about Kepler's second law of celestial mechanics.
开普勒第二定律当然也对，如果东西远离了。
But, Kepler's law would also be true, actually, if things were going away.
开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。
So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.
开普勒第二定律指行星的轨道速度与其和太阳的距离。
Kepler's second law means that a planet's orbital speed changes with its distance from the sun.
事实上，如果你观察带电粒子，在点电荷引起的电场中的运动，它也满足开普勒第二定律。
So, actually, if you look at motion of charged particles in an electric field caused by a point charged particle, it also satisfies Kepler's law, satisfies the same law.
开普勒第二定律，也即面积定律，指出从太阳到行星所联接的直线在相等时间内扫过同等的面积。
The second law, the law of areas, states that a line connecting a planet to the sun covers an equal area over equal periods of time.
利用几何方法及计算机模拟研究开普勒第二定律，运算结果面积速度近似为常量，本文中精度为1 0 - 13。
Using a geometric method and computer simulation, the second Kepler's Law is studied. The calculated result shows that the areal velocity is approximately constant with an accuracy of 10 -13 .
利用几何方法及计算机模拟研究开普勒第二定律，运算结果面积速度近似为常量，本文中精度为1 0 - 13。
Using a geometric method and computer simulation, the second Kepler's Law is studied. The calculated result shows that the areal velocity is approximately constant with an accuracy of 10 -13 .
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