购物作为人们日常生活的必须活动，从人类文明开始就一直存在了。
Shopping as an essential activity of daily life, from the beginning of human civilization has existed.
如果不能说在人类文明开始之前人们就学会制造乙醇，那这也是人类文明刚刚出现就有的事了。
People have known how to make ethanol since the dawn of civilisation, if not before.
在美洲大陆上的人类文明可能开始于上一个冰河世纪，史前猎人在当时穿过了亚洲和美洲大陆之间的大陆桥。
Human civilization in America probably began in the last ice age, when prehistoric hunters crossed a land bridge between the Asian and American continents.
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