Just imagine if the great inventors or explorers of the past had feared the unknown. Then entire population of the world would still reside in the Tigris-Euphrates Valley.
想象一下过去的那些伟大的发明家和先驱者都惧怕未知，那么我们的整个人类社会恐怕至今还在底格里斯河和幼发拉底河流域停留着呢。
Just imagine if the great inventors or explorers of the past had feared the unknown. Then entire population of the world would still reside in the Tigris-Euphrates Valley.
想象一下过去的那些伟大的发明家和先驱者都惧怕未知，那么我们的整个人类社会恐怕至今还在底格里斯河和幼发拉底河流域停留着呢。
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