小麦，玉米和棉花是美国的三种主要农作物。
Wheat, corn and cotton are the three main crops of the United States.
但是全世界的食物中，有一半来自于三种植物：大米，玉米和小麦。
But half of the world's comes from only three plants: rice, corn and wheat.
但是全世界的食物中，有一半来自于三种植物：大米，玉米和小麦。
But half of the world's comes from only three plants: rice, corn and wheat.
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