The service layer is no longer dependent on model state.
service层不再对模型状态（model state）产生任何依赖。
Each mathematical model is time-dependent.
每个数学模型都有时效性。
The resistance probability model is the foundation for study on time-dependent reliability of bridge.
构件的抗力概率模型是进行桥梁结构时变可靠性研究的基础之一。
The resistance probability model is the foundation for study on time-dependent reliability of bridge.
构件的抗力概率模型是进行桥梁结构时变可靠性研究的基础之一。
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