preharvest spray

例句：

1. 1. The farmersuse preharvest spray to protectthe crops from pests before they areharvested.
   农民们在收获前使用喷洒剂来保护作物免受害虫侵害。
2. 2.The preharvest spray is designedto control weeds and prevent soilerosion.
   这种预收割喷雾旨在控制杂草并防止土壤侵蚀。
3. 3. The preharvest spray helps to maintain thequality of the crop and ensures a successfulharvest.
   预收割喷雾有助于保持作物质量，确保丰收。