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Roof fall in mines is one of the severe disasters in mining operation.
矿山冒顶是矿山生产过程中严重灾害之一。
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Mine water invasion is one of the main disasters in the the mining area.
矿井突水是该矿区的主要灾害之一。
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Mine water invasion is one of the main disasters in the the mining area.
矿井突水是该矿区的主要灾害之一。
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