And after decades of widespread use, the chemical insecticides used to kill them are losing their power.

经过数十年的广泛使用，用于杀死它们的化学杀虫剂正在失去效力。

While most countries fight back with chemical insecticides, some regions have found success using fungal diseases that are lethal to locusts but safe for people and the environment.

虽然大多数国家使用化学杀虫剂进行反击，但一些地区已经成功使用对蝗虫致命但对人类和环境安全的真菌病害。