提出利用空气幕控制火灾烟气扩散的方法，以达到安全疏散观众的目的。
Proposes using an air curtain to control smoke spreading for safe escape of the audience.
列车在自然通风隧道内发生了火灾，如何控制火灾烟气扩散以保证人员安全疏散，是值得深入研究的课题。
When the train fire occur inside the tunnel with natural ventilation, how to control smoke spreading in order to ensure the safety of evacuation, is a worth deeply research project.
它被称为疏散星团，因为它的成员恒星结构松散而且还有恒星在扩散离开星团。
It is called an open cluster because its stars are loosely bound and have started to spread out.
它被称为疏散星团，因为它的成员恒星结构松散而且还有恒星在扩散离开星团。
It is called an open cluster because its stars are loosely bound and have started to spread out.
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