The earth developed from a planetary embryo in the solar nebula into the third planet of our solar system.
地球在早期的太阳星云中由行星胎成长为太阳系的第三颗行星。
The idea here is that - while Earth formed slowly from planetary embryos colliding - Mars is itself a solitary planetary embryo that formed very early in the history of our solar system.
这里想表达的观点是，当地球从行星胚胎间相互碰撞缓慢形成时，火星却是一个孤独的行星胚胎，在太阳系历史上形成得很早。
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