Through the application of tenable environment concept, the aim is to let passenger successfully evacuate under the longitudinal ventilation when fire occurs.
通过引入可维生环境的设计概念，当隧道内发生火灾时，利用纵向通风模式达到满足隧道内人员疏散逃生要求的目的。
Reserve calculations have been based on a series of suppositions that in the present environment are no longer tenable.
储量的计算根据是一系列的假设，在目前环境下这些假设已经站不住脚。
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