有些杀虫剂对保护人类及动物健康起着至关重要的作用。
Some of the pesticides are essential for protecting human and animal health.
世卫组织于今年9月宣布，室内喷洒滴滴涕和其它杀虫剂将再次在其抗击疟疾的努力中发挥重要作用。
In September, WHO announced that indoor spraying with DDT and other insecticides would once again play a major role in its efforts to fight the disease.
可能是一种疾病、也许是一种新的疾病，招致其他疾病感染蜜蜂，还可能是某种杀虫剂起了这种作用。
It could be that one disease, perhaps a new type of lurgy, invites the others to infect the bee, or that a pesticide performs this role.
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