但是对于相互间不发生交互的双星系统，当它们旋转着接近对方时，天文学家就可以精确地测量出其公转周期的改变量。
With a noninteracting pair, astronomers can precisely measure the change in the orbital period of the stars as they spiral toward each other.
它并不只是简单地绕原子核旋转，而是同时进行公转和自旋。
It doesn't simply orbit the nucleus, but as it orbits it spins.
地球绕一个贯穿南极点和北极点的假想轴旋转，这个假想轴称为地轴。同时也绕太阳公转。
The Earth spins on an imaginary line called an axis that runs from the north pole to the south pole, while also orbiting the sun.
它围绕其恒星飞快旋转的速度是地球绕太阳公转速度的7倍，它距那颗恒星的距离比起水星离太阳距离要近23倍。
The planet whizzes around its star more than seven times faster than Earth moves, and is 23 times closer to the star than Mercury is to our sun.
你们的月亮绕地球公转的周期是655.719小时，而绕它自己的轴完全旋转的周期也是655.719小时；所以你。
Your Moon rotates around your planet in 655.719 hours, and also spins on its axes one full.
根据客户需要，旋转系统可设计为仅实现工件沿中心轴做圆周公转。
The rotating system could be designed to realize work pieces only rotate along the center axis according to customer's requirement.
根据客户需要，旋转系统可设计为仅实现工件沿中心轴做圆周公转。
The rotating system could be designed to realize work pieces only rotate along the center axis according to customer's requirement.
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