Safety levels for any pesticide are calculated over a number of formal assessments. 任一杀虫剂的安全水平以一定数量的正式评估来计算。
Recently the development of a new-type organophosphorous pesticide with ternary asymmetric structure and heterocycle structure has been very active. 带有三元不对称结构和杂环结构的新型有机磷杀虫剂的开发，近年来一直比较活跃。
