继而研究了在该模型中系统寿命的随机单调性，并且进一步讨论了系统寿命的年龄性质。
Moreover, the stochastic monotonicities and the aging properties of the system lifetime are studied in this model.
针对建筑物时效变形具有一定单调性和弱随机性的特点，引入灰色系统理论。
According to the characteristics that the aging deformation of building is monotonous and less random, we introduce gray system theory.
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