例句與造句

1. Method for the determination of pyrethrins residuesin cereals for export
   出口糧谷中天然除蟲(chóng)菊素殘留量檢驗(yàn)方法
2. Pyrethrins and pyrethroids are usually applied as space spray i . e . by fogging to kill mosquitoes in contact
   擬除蟲(chóng)菊酯通常以噴霧方式作空間處理，直接殺死接觸到藥?kù)F的蚊子。
3. Natural pyrethrins is a botanical insecticide made from extracts of chrysanthemum flowers while pyrethroids such as s - bioallethrin , cypermethrin , permethrin and cyfluthrin are its synthetic chemical analogues
   天然除蟲(chóng)菊素是一種從菊花提煉的植物性殺蟲(chóng)劑，而擬除蟲(chóng)菊酯是類(lèi)似天然除蟲(chóng)菊
4. It's difficult to find pyrethrins in a sentence. 用pyrethrins造句挺難的