青云翻译

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In recent years, the mine disaster occurred, many of the families of the victims caught in endless sorrow, it has also made it extremely embarrassing situation caused a lot of social problems, has seriously constrained the further economic development. So for mine safety research become today an imp

In recent years, the ore difficult to occur repeatedly, lets the multitudinous victim family member fall into inexhaustibly sorrowful in, also lets the government the situation be extremely awkward, from this has initiated the very many social question, has restricted the economical further developm

正在翻译，请等待...

In recent years, the mine disaster occurred, many of the families of the victims caught in endless sorrow, it has also made it extremely embarrassing situation caused a lot of social problems, has seriously constrained the further economic development. So for mine safety research become today an imp