这条定律的唯一条件是没有不平力的影响。
The only condition for this law is no unbalanced force should act upon it.
开普勒第三定律给出了一个关于力的本质的更为具体的说明。
Kepler's third law gave a more specific hint about the nature of the force.
开普勒第三定律给出了一个关于力的本质的更为具体的说明。
Kepler's third law gave a more specific hint about the nature of the force.
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