UML, an important tool of oo system modeling, is a general and graphic modeling language which can be used in the whole system developing life cycle.
UML是一种支持系统开发全过程的图形化建模语言，是面向对象系统建模的重要工具。
UML, an important tool of oo system modeling, is a general and graphic modeling language which can be used in the whole system developing life cycle.
UML是一种支持系统开发全过程的图形化建模语言，是面向对象系统建模的重要工具。
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