Because models are part of the system definition, rather than documentation, they are never out of date and are reliable.
因为模型是系统定义的一部分，比起文档，它们从不会过时，而且是可靠的。
The rose is going to remain the most popular flower because love is never out of date.
玫瑰花永远是最受欢迎的花，因为爱情永远不会过时。
The basic problems of Literature are never out-of-date.
文学的基本问题永远也不会过时。
The complicated social reality shows people once more that righteousness-benefit relations are always a never out-of-date issue that every society and person must face up to and handle rationally.
纷繁复杂的社会现实再次告示人们，义利关系始终都是每个社会，每个人必须面对、理智处理的一个常议常新的命题。
The complicated social reality shows people once more that righteousness-benefit relations are always a never out-of-date issue that every society and person must face up to and handle rationally.
纷繁复杂的社会现实再次告示人们，义利关系始终都是每个社会，每个人必须面对、理智处理的一个常议常新的命题。
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