The fire load of underground commercial building is very large and controlling fire is difficult.

同时，地下商业建筑的火灾荷载大，且地下商业建筑的防火救火工作具有相当大的困难。

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The fire load of underground commercial building is very large and controlling fire is difficult.

同时，地下商业建筑的火灾荷载大，且地下商业建筑的防火救火工作具有相当大的困难。

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