Business analysts can use class diagrams to model systems from the business perspective.
业务分析师可以用类图，为系统的业务远景建模。
The team used three model systems.
研究小组使用了三种模型体系。
These model systems possess the advantages of low price, short period and easy to repeat.
用小鸡建立学习记忆模型研究学习记忆，具有成本低，周期短，实验重复性好等优点。
These model systems possess the advantages of low price, short period and easy to repeat.
用小鸡建立学习记忆模型研究学习记忆，具有成本低，周期短，实验重复性好等优点。
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