Generally, the delay is considered as constant and unknown.
通常这种时滞被认为是不变和未知的。
The model considered the influence of the crowd density on the evacuation capability, and the capacity of the egress was taken as a variable rather than a constant as former.
模型中考虑了人群密度对疏散能力的影响，改变以往把建筑出口疏散能力视为常数而带来的不能真实反应其疏散能力的状况。
Due to constant changes in technology and industry practices this standard cannot be considered an exhaustive, all-inclusive resource or as a substitute for sound engineering judgment.
随着技术和行业惯例不断变化，本标准无法作为详尽而完整的资源，也不能替代完整的工程评价。
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