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人们对现有柴油机废气污染控制装置一直批评较多。但是,现在在减少废气排除物中的污染物方面已有一些进展,而且,为了保护矿工的健康,一般都加强了措施。
There have been many criticisms of existing diesel engine exhaust pollution control devices. However, some progress has been made in reducing pollutants in exhaust emissions, and measures have generally been stepped up to protect the health of miners.