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.
这是因为相对于我们食物中的原材料——小麦，玉米和大豆的价格变化，谷物，鸡蛋，奶酪和肉类的零售价格通常会滞后数月或者更长。
That's because retail prices for cereal, eggs, cheese and meat generally lag by several months or longer world prices for wheat, corn and soybeans - the raw ingredients of so much of our food.
联合国粮农组织星期三公布的报告显示，小麦、玉米和其它谷物的生产成本提高。
Wednesday's report from the Food and Agriculture Organization showed cost increases for wheat, corn and other grains.
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