Dowfume F(熏蒸杀虫剂)

例句：

1. 1. The farmers used Dowfume to control the pests on their crops.
   农民们使用Dowfume来控制他们作物上的害虫。
2. 2.The company is introducing a new Dowfume that is more effective than its previous version.
   该公司正在推出一种比其之前的版本更有效的新的Dowfume。
3. 3.Dowfume is a highly toxic substance that can be dangerous if not handled properly.
   Dowfume是一种高度有毒的物质，如果处理不当可能会很危险。