这次人口普查不同于以前的人口流动研究是因为。

The census distinguished itself from previous studies on population movement in that.

youdao

以前，要养活世界最多的人口是很困难的。

It was difficult to feed the largest population in the past.

youdao

人类为了养活比以前更多的人口，需要获得可耕地，因此大量砍伐树木。

To feed the larger population, humans need to obtain arable land, so there is a massive clearing of trees.

youdao

London, already by the late sixteenth century, one-sixth of all the people, I think this is E.A. Wrigley who pointed this out a long time ago--one-sixth of all the people in England went to London frequently, because London was absolutely gigantic as a city.

伦敦,早在十六世纪后期,六分之一的人口,我想是E.A莱格力很久以前给出的这个数据,他指出,当时有六分之一的英国人,会经常去伦敦,因为伦敦当时是个巨型城市

耶鲁公开课 - 欧洲文明课程节选