双语例句原声例句
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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.
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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.
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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.
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It doesn't simply orbit the nucleus, but as it orbits it spins.
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。
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