N any of various prehistoric primates that resembled modern man 原人
ADJ of or relating to any of these primates 原人的
Proto-dogs scavenged around the outskirts of human settlements about 10, 000 to 12, 000 years ago, removing food scraps, feces, and other human waste.
大约10000-12000年前，原始犬类远居于人类居住地，清除残羹、粪便和其他的人类垃圾。
So it seems that even more ancient proto-human species knew how to sail.
看来似乎更早期的原始人类已经知道如何航海了。
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