英语语法分析

Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins.

实验室测试表明，这些千足虫体内的分泌物富含两种化学物质，这两种物质是有效的驱蚊剂，而蚊子携带的寄生虫会削弱卷尾猴的能力。

Some people use insect repellents to ward off mosquitoes in summer.

在夏天，许多人用杀虫剂来避蚊子。

But I do have a hard time protecting myself from insect repellents that humans sometimes spray on plants.

但我确实也有不好过的时候，就是保护自己免受有时人类喷洒在植物上的驱虫剂的侵害。