... 低瓦斯矿井 low gaseous mine 多尘瓦斯矿 closed lammine; gaseous and dusty mine; gaseous-and-dusty mine 二级瓦斯矿 second category gassy mine ...
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gaseous and dusty mine 多尘瓦斯矿
gaseous s and dusty mine 多尘瓦斯矿
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