1·The old theory of how insect repellents work was that DEET blocks the insect's ability to detect lactic acid from people, which acts as a mosquito magnet.
过去关于驱虫剂的作用原理的理论是DEET阻断了昆虫侦测到人体散发的乳酸气味的能力，而乳酸对蚊子来说就像磁铁一样有吸引力。
2·They've used chemical repellents, lasers and fake predators, and even killed some, to the outrage of bird lovers.
他们曾用过化学驱虫剂、激光和假的天敌来驱赶它们，甚至还捕杀过一些，这引起了爱鸟人士的愤慨。