pyrethrum flowers
英 [paɪˈriːθrəm ˈflaʊəz]
美 [paɪˈriːθrəm ˈflaʊərz]
【化】除虫菊花
双语例句
- An insecticide derived from a plant, e.g. pyrethrum ( from Chrysanthemum flowers).
3来源于植物的杀虫剂，例如除虫菊（来源于菊花）。 - Pyrethroid insecticides are developed from lead compounds that are the effective components extracted from natural pyrethrum flowers.
拟除虫菊酯类农药是根据天然除虫菊花中提取的杀虫组份经结构改造而发展起来的一类重要的合成杀虫剂。