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pollutant level A value representing the concentration of a polluting agent in a specified area, often determined by a measuring and recording device (在一个特定的区域代表污染浓度的一个值,通常由测量和记录设备决定。) | |||
contaminant level |
污染物水平 : 14 phrases in 3 subjects |
Earth sciences | 3 |
Technology | 7 |
Water resources | 4 |