Is to feed themselves and their family. 就是养活自己和家人

264. They learned to increase the yield and multiply the number of varieties.
     他们学会了提高产量 种植多样化
265. Like every species on earth,
     像地球上所有物种一样
266. The principal daily concern of all humans...
     所有人类日常首要关心的
267. Is to feed themselves and their family.
     就是养活自己和家人
268. When the soil is less generous and water becomes scarce,
     当土壤不再富饶 水源不再充足
269. Humans deploy prodigious efforts to mark a few arid acres...
     人类会做出惊人的努力
270. With the imprint of their labor.
     辛勤劳作开垦贫瘠的土地

来自《家园 第一部分 Home Part1》第 267 行