field locking

例句：

1. 1. The farmers have field locked to prevent the weeds from spreading.
   农民已经对田地进行了封锁，以防杂草蔓延。
2. 2. The police were field locked in the city center, preventing any looting.
   警方在市中心进行田野封锁，以防止抢劫。
3. 3. The scientists are conducting field experiments to study the effects of climate change onagriculture.
   科学家们正在进行田野实验，以研究气候变化对农业的影响。