农民们了解到豌豆和豆子对昆虫的抵抗力要小得多，而玉米是一种比小麦更强壮的谷物。

Farmers learned that peas and beans were far less vulnerable to the insects, and corn was a more robust grain than wheat.

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事实上，这是一个古怪的问题，如果世界短缺玉米和小麦，农民种出更多的粮食来就好了（如果天气没问题）。

On the face of it, that is an odd question. After all, if the world runs short of corn or wheat, farmers can simply grow more, weather permitting.

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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.

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