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地球在自转,同时还围绕太阳公转。自转和公转在永不停止地进行。就这样在地球表面上,不知经过了多少个日日夜夜,多少个春夏秋冬。结果在地球表面上的生物层,却发生了极不寻常的变化。按着时间的顺序,从无生到有生,从简单生命到变形虫,由单细胞动物到复细胞动物,由水生到陆生,由冷血到热血,由热血到胎生,由胎生又到脑子的特别发育,一直到人类的出现。所有这些都经过
The Earth is spinning and revolves around the sun. Rotation and revolution never stop. So on the surface of the earth, I do not know how many days and nights, how many seasons. As a result, the biological layer on the surface of the earth has undergone a very unusual change. According to the order of time, from no life to life, from simple life to amoeba, from single-celled animals to complex-cell animals, from aquatic to terrestrial, from cold to blood, from blood to viviparous, from viviparous to brain The special development, until the emergence of mankind. All this is done