目前，在世界范围内，80%以上适合种植农作物的土地都在使用中。

At present, throughout the world, over 80% of the land that is suitable for raising crops is in use.

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许多农作物的种植都是在农业革命期间发展起来的，当时人类社会正从游牧生活的狩猎和采集活动向园艺和农业过渡。

Many crops were developed during the agricultural revolution when human societies made the transition from nomadic hunter-gatherers to horticulture and agriculture.

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随着人口密度的增长，农作物的种植已经扩展到了越来越干旱的地区。

The cultivation of crops has expanded into progressively drier regions as population densities have grown.

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You might even see the farmers sometimes who brought the food into market, and that was certainly true in earlier days.

有时候你甚至能在市场看到,农民在贩卖他们的农作物,过去的确是这样的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

They have an agricultural revolution, investment in commercialized agriculture, and increase in the production in rural areas.

英国也进行了农业革命,他们还对商品化的农作物进行投资,使得乡村地区的产量有了很大的提高

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Well, now one of the things farmers in history discovered is that it's very hard to do well as a farmer if all you do is grow the crops, because people normally don't use what you grow in the form in which you grow it.

关于农民我们在历史上能够得知的一件事是,当好农民很困难,特别是只种农作物的农民,因为人们一般不会将,你从地里种出来的东西留作种子

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