certified fumigant

例句：

1. 1. The companyuses certified fumigant to controlpests in their crops.
   该公司使用认证的熏蒸剂来控制其作物中的害虫。
2. 2. The certified fumigantis effective against a wide range of insects.
   这种认证的熏蒸剂对多种昆虫都有效。
3. 3. To prevent the spread of diseases, farmers use certified fumigantduring harvest.
   为了防止疾病传播，农民在收获时使用认证的熏蒸剂。