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地球的自转角度能够保持不变，完全是因为有了月球的引力拉动。
The Angle of earth's spin is constant only because the moon's gravitational pull.
youdao
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因为地球在自转，看上去就有了日出和日落。
The sun appears to rise and set because of the earth's rotation.
youdao
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因为地球在自转，看上去就有了日出和日落。
The sun appears to rise and set because of the earth's rotation.
youdao