以前人们认为地球是平的，所以人类从未征服过地球。
Believed to be flat, the earth was never conquered by human beings.
史前人类从未向雷克斯暴龙扔过长矛，但确实猎杀过猛犸象和乳齿象。
Prehistoric humans never threw spears at Tyrannosaurus rex but really did hunt mammoths and mastodons.
也许，首先古人类从未接触过此病毒。
Perhaps, he points out, ancient humans were never exposed to the virus in the first place.
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