weed killers

同根派生

Tell people why it is harmful to use insecticides and weed killers.
（一）告诉人们使用杀虫剂，除草剂等化学药品是如何有害。
The grass on the lawn grows wildly, we must use some weed killer.
这片草地的草长得太杂了，我看要用些除草剂了。
Tell people why it is harmful to use insecticides and weed killers .
（一）告诉人们使用杀虫剂，除草剂等化学药品是如何有害。
You need a selective weed killer that won't damage your garden flowers.
你需要一种精选的除草剂，不会伤害你花园的花。
Modern weed killers are put in two categories, selective (affecting specific plant species) and nonselective (affecting plants generally).
现代的除草剂可分为两类:选择性的（仅对特定的植物有效）及非选择性的（作用及于各种植物）。