noun 下载 🔗分享 污染物,污染源 A foreign substance that makes something dirty, or impure, especially waste from human activities. Examples : "Car exhaust is a major pollutant in many cities, making the air unhealthy to breathe. " 汽车尾气是许多城市的主要污染物,使空气变得不健康,不适合呼吸。 environment substance industry 与AI对话词汇游戏阅读练习