一旦某颗小行星开始接近地球，它会在重力作用下，像跳华尔兹一样，一次又一次接近地球，因为它和地球一样也绕太阳运行。
Once an asteroid starts approaching Earth, it will do so again and again in an orbital waltz driven by gravity as both bodies travel around the Sun.
行星以某轨迹绕太阳运行。
Well, the planet orbits around the sun -- -- in some trajectory.
一个飞盘是有边缘，所以可以，让它绕着边缘上某点旋转，就像这样，绕边缘点转动它。
A Frisbee has this rim so you can actually try to make it rotate around the point on the circumference by holding it near the rim and spinning it there.
挡墙采用的变位方式为：平移（T）、绕墙顶上某点转动（RTT）和绕墙底下某点转动（RBT）。
The types of wall movement includes translation(T), the rotation about a point above the wall top(RTT) and rotation about a point below the wall base(RBT).
设P和Q为平面内两个互不相交的简单多边形 ，若 P在平面内绕某点旋转 ，文中讨论了其旋转可移动性问题 。
Let P and Q be two nonintersecting simple polygons in the plane, this paper discusses the rotational movability of them if P rotates around a point and collides with Q .
设P和Q为平面内两个互不相交的简单多边形 ，若 P在平面内绕某点旋转 ，文中讨论了其旋转可移动性问题 。
Let P and Q be two nonintersecting simple polygons in the plane, this paper discusses the rotational movability of them if P rotates around a point and collides with Q .
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