因此，研究楼梯间及电梯井中烟气运动规律及其控制具有重要的实际意义。

Therefore, it is very important to study smoke movement and its control in the stairwell and elevator shaft.

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因此，研究楼梯间及电梯井中烟气运动规律及其控制具有重要的实际意义。

Therefore, it is very important to study smoke movement and its control in the stairwell and elevator shaft. Smoke movement is very complex in the stairwell and elevator shaft.

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