I went to the Barnes and Noble, and I got a textbook, and from the data that was in that textbook I derived Kepler's laws.

我去了巴诺书店（译注：美国最大零售连锁书店）， 拿了一本教材，根据那本书的数据， 我推导出了开普勒定理。

We also talked about Kepler’s three laws, and calculated the gravitational acceleration on the surface of Mars.

我们还讲了开普勒三定律， 计算了火星表面的重力加速度。

We also talked about Kepler's three laws, and calculated the gravitational acceleration on the surface of Mars.

当我们谈到开普勒三定律时， 我们计算了火星上的重力加速度。

And that's what's known as Kepler's first law, and it actually applies to any elliptical

切割曲率。这被称为开普勒定律 首先，它可以应用于任何椭圆轨道。

The authenticity of this story cannot be verified and in fact, it was Kepler's three laws that truly motivated the formulation of the law of universal gravitation.

这个故事的真实性无法证实，事实上，真正推动万有引力定律制定的是开普勒三定律。