例如，想象一下经化学处理的蚊帐。

Consider, for example, chemically treated bed nets.

youdao

另外，维生素a的使用增强了孩子们的免疫力，化学处理过的蚊帐预防疟疾，这些都能减少儿童死亡人数。

Also, vaccinating children against measles has saved many lives. So has the use of vitamin a to strengthen children's immune systems, and chemically treated bed nets to prevent malaria.

youdao

试举一例，化学处理的蚊帐，这些蚊帐可以杀死蚊子并防止疟疾，在人们睡觉时。

Consider, for example, chemically treated bed nets. These bed nets kill mosquitoes and protect people against malaria while they are sleeping.

youdao