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来源:雅诚德英语网
They're basically made up of debris left over from the origin of the solar system.
它们基本上是由太阳系起源时遗留下来的碎片组成的。
They're basically made up of debris left over from the origin of the solar system.
它们基本上是由太阳系起源时遗留下来的碎片组成的。