对于象股市、地震和森林火灾等复杂的系统，物理学家们了解的一点是，当变化发生时，它们的规模不变。
One thing that physicists have learned about complex systems, such as stock markets, earthquakes, and forest fires, to name just a few, is that when changes occur they are scale invariant.
烟气是火灾过程的重要物理现象。
The smoke is the important physical phenomenon in fire process.
巷道火灾节流过程中各物理参数变化时序是正确模拟非稳态火灾过程和救灾决策的基础。
In the process of tunnel fire throttling, the variation time sequence of various physical parameters is the bases for accurately modeling the unsteady fire process and fire fighting decision-making.
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