pyrethrins造句

Method for the determination of pyrethrins residuesin cereals for export
出口粮谷中天然除虫菊素残留量检验方法
Pyrethrins and pyrethroids are usually applied as space spray i . e . by fogging to kill mosquitoes in contact
拟除虫菊酯通常以喷雾方式作空间处理，直接杀死接触到药雾的蚊子。
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
天然除虫菊素是一种从菊花提炼的植物性杀虫剂，而拟除虫菊酯是类似天然除虫菊
It's difficult to find pyrethrins in a sentence. 用pyrethrins造句挺难的