And, that's the plane that contains the origin, the point, and the velocity vector.

并且这个平面包含了原点和动点，以及速度矢量。

youdao

See the point in the middle, at the origin, is a saddle point. If you look at the tangent plane to this graph, you will see that it is actually horizontal at the origin.

我们来看中间的那个点，在原点上，那就是一个鞍点，在这点做一个切平面,你可以看到这个切平面,是在原点上水平的。

youdao

This could explain the origin of some of the exoplanets that have been detected with orbits significantly tilted with respect to their star's equatorial plane, Thies says.

它可以解释某些外行星的起源，这些外行星已被检测出它们的运行轨道明显地与它们所围绕恒星的赤道平面相倾斜，蒂斯说。

youdao

That's the plane with some origin here.

这是一个平面,这里是原点

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