农民们将所有剩余农产品送到市场去卖。
贸易能将这个国家的剩余加工产品卖到国外以换回农产品，否则这个国家就会缺乏农产品。
Trade makes the country possible for her surplus manufactured goods to be traded abroad for the agricultural products that would otherwise be lacking.
农产品的出现产生了可以储藏的剩余食物，也赋予土地以价值，相对平等的生存方式亦有了被打破的可能。
The invention of agriculture, which generates a surplus that can be stored and also gives value to land, permitted this to change.
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