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| air quality control The measurement of ambient air-pollution concentrations in order to determine whether there is a problem in a given region (测量周围空气的污染浓度，以判断特定地区是否有空气污染问题。); air quality control | |||
| control over atmosphere quality | |||
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空气质量控制 : 1 phrase in 1 subject |
| Environment | 1 |
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