So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.
开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。
I'm pretty sure that Sir Isaac would have loved to see this, as it would have proved his first law of motion to be correct.
我相信伊萨克·牛顿爵士也很想见到这一切，因为这能证明他的第一运动定律的正确性。
Newton's first law of motion is not as self-evident as it may seem.
牛顿第一运动定律并不是一看就能明白的。
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