Organophosphates are broad - spectrum contact insecticides with relatively higher toxicity and longer residual activities 有机磷是广谱触杀性除害剂,毒性相对高,效力较持久。
2.
These chemicals are broad - spectrum contact insecticides that provide rapid knockdown effects on insects but with only little residual activity 这些化学品是广谱触杀性除害剂,具快速触杀作用,但残留效力并不持久。