ground-level
adjective1 搭配平均频率: 6.5
地面臭氧
refers to ozone in the troposphere, the layer of the atmosphere closest to the Earth's surface
烟雾的主要成分,吸入有害
地面臭氧
refers to ozone in the troposphere, the layer of the atmosphere closest to the Earth's surface
烟雾的主要成分,吸入有害