而那些黑色的区域可能是农田，主要农作物产出的是小麦和玉米。
The dark regions are mainly agricultural fields, with wheat and corn being the major crops.
这片土地很广阔，也很平坦，其主要农作物是玉米、小麦和大豆，但我们再往西，从农田的小道，我们来到了一片野草地。
The land is big and mostly flat with many fields of corn, wheat and soybeans. But as we travel west, the cropland gives way to wild grasses.
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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