人们用化肥来种植庄稼和植物，很多化肥最终会从陆地流入海洋。
People use fertilizer for their crops and plants and a lot of it eventually makes its way from land into the seas.
然后，有些人学会种植庄稼和饲养动物的食品。他们的第一个农民。
Then, some people learned to grow crops and raise animals for food.
为了维系简朴的生活，我们必须有足够的土地来种植庄稼和足够的牧场来养牛。
For plain living we must have sufficient land for raising crops and pasturing grounds for the cows.
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