The largest risk in coal mining is the collapse of the mine.
出现的最大危险就是巷道崩坍。
Ground collapse will seriously threaten the mine production security and destroy the surface ecological environment.
地表塌陷严重威胁着矿山安全生产，破坏地表生三态环境。
Ground collapse will seriously threaten the mine production security and destroy the surface ecological environment.
地表塌陷严重威胁着矿山安全生产，破坏地表生三态环境。
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