Agricultural societies cannot exist without staple crops.
农业社会的存在离不开主粮作物。
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All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams.
西非所有从某个未知的日期开始记录的主要农作物都是从其他地方引进的，刚开始是种植水稻和山药。
China has set up 11 research stations in Africa to boost yields of staple crops.
ECONOMIST: Buying farmland abroad
Those that have done best are now moving away from staple crops to higher-value things such as flowers and fruit.
Because rice is grown in heavily irrigated conditions, it is more susceptible than other staple crops to environmental pollutants in irrigation water.
BBC: US rice imports 'contain harmful levels of lead'
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