This is the first time that this example is using a relation as a declarative statement to define an expression (in other words, a value assignment) instead of using it for model-to-model mapping.
这是本例子第一次把关联作为一个定义表达式(换句话说，一个赋值语句)的声明性陈述来使用，而不是用它作模型到模型的映射。
For those who would like to extend this to a more sophisticated model, consider adding in depreciation and the time value of money.
如果愿意使用更复杂的模型，可以考虑加上现金的时间价值折算。
This paper, based on the consideration of the varying reliability with time and the time value of capital, presents a dynamic model and makes simulation analysis.
本文在考虑可靠性随时间变化和资金时间价值基础上提出了动态模型，并进行了模拟与分析研究。
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