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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