The team used three model systems.
研究小组使用了三种模型体系。
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 desert rodent communities are the important model systems in the research of community ecology.
荒漠鼠类群落是群落生态学研究中重要的模型系统。
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