each of which contributing according to its 错误点: 从句没有谓语不完整
each已经非常明确的指代了前面的other planets,无需再添加of which,属于多余。
each of which contributing according to its 错误点: 从句没有谓语不完整
each of which 引导的从句没有谓语
contributing! 独立主格没有谓语动词
错误在于从句没有动词, each of which contributing according to its mass and distance from the others
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