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air quality control
environ. 空气质量控制
air quality control The measurement of ambient air-pollution concentrations in order to determine whether there is a problem in a given region
environ. 空气质量控制 (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
: 7 phrases in 4 subjects
Aviation3
Climatology1
Ecology1
Environment2

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