... Our Ancient Ancestors 我们的古代祖先 How Old Are We? 我们的年龄有多大? Two Hominids, Two Diets 两种人科动物，两种食性 ...
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例如，DNA研究就显示古代人类的祖先也曾进行杂交，尼安德特人的基因很可能已被我们的基因库所吸收，而他们做为不同的原始人类物种却已经消失。
DNA studies, for example, suggest that our ancient human ancestors interbred, with Neanderthals possibly being absorbed into our gene pool and disappearing as their own distinct hominid species.
没有人知道我们的哪个古代原始祖先首先开始使用火。
No one knows what ancient savage ancestor of ours first begin to make use of fire.
在古代的中国，黄色代表土地——而我们的祖先长久以来一直认为地球就是宇宙的中心。
To the ancient Chinese, yellow represents earth - and the earth, which for a long time was considered the center of the universe by our ancestors.
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