pyrethrum [paɪ'ri:θrəm]

例句:

• An aerosol fly killersone containing a pyrethrum knock-down ingredient.
  来自T. Hooper
• The output of some export crops, notably cashews, cotton, and pyrethrum, fell drastically.
  有几种出口农作物, 特别是腰果 、 棉花和除虫菊的产量大幅度下降.
  
• 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 ).
  
• This article draws up the pyrethrum ester insecticide.
  本品是拟除虫菊酯类杀虫剂.