We need a mass of practice and experiential accumulation in order to roundly master and apply it When we use the UML language to build system model, it isn't to build only one.
但要想全面地掌握和应用它，是要大量的实践和经验的积累。用UML语言建造系统模型的时候，并不是只建一个模型。
We need a mass of practice and experiential accumulation in order to roundly master and apply it When we use the UML language to build system model, it isn't to build only one.
但要想全面地掌握和应用它，是要大量的实践和经验的积累。用UML语言建造系统模型的时候，并不是只建一个模型。
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