The seam water injection is an effective measure to control coal dust concentration.
煤层注水是降低矿井粉尘浓度的有效措施之一。
The concentration of SO2 and dust in air is over the national standard enormously.
空气中的烟尘、SO2浓度远远超过了国家标准。
The concentration of SO2 and dust in air is over the national standard enormously.
空气中的烟尘、SO2浓度远远超过了国家标准。
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