field reduction

例句：

1. 1.The farmers have reduced the amount of fertilizer used in their fields.
   农民们已经减少了他们在田地里使用的肥料量。
2. 2.The government has implemented a policy to reduce the number of cars on the road.
   政府已经实施了一个政策，以减少道路上的汽车数量。
3. 3. The scientists are conducting experiments to determine the extent of field reduction in this region.
   科学家们正在进行实验，以确定该地区田野减少的程度。