主要农作物为水稻。
这是世界上一些主要农作物产量增长速度的下降。
This is the decline in the growth in yields of some of the world's major crops.
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。
All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams.
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