地球，这颗蔚蓝色的星球在无垠的宇宙空间不过是沧海一粟，却是孕育人类的摇篮。当人类的始祖始用双手制造简陋的石器，便与猿相揖别，人类的历史也徐徐拉了帷幕。 地球，这颗蔚蓝色的星球在无垠的宇宙空间不过是沧海一粟，却是孕育人类的摇篮。当人类的始祖始用双手制造简陋的石器，便与猿相揖别，人类的历史也徐徐拉了帷幕。
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