The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。
The angular momentum of the Earth's rotation was so small a fraction of the speed of light, I know, that no possible instrument could detect a difference;
地球自转的角动量只是光速的很小一部分，我知道，不可能有仪器能检测到一个差值；
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