It is greatly convenient for the safe management of the mined-out area.

该系统的应用可极大地方便采空区的安全管理。

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After the whole area has been mined out, all the miners have left.

整个地区的矿全都挖光后，所有的矿工就都离开了这里。

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The whole area has been mined out.

整个地区的矿藏都被采光了。

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The whole area has been mined out.

整个地区的矿藏都被采光了。

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