Choosing the scope of our model follows from our objectives, from what we want to learn or to communicate: the making of models is a purposeful undertaking.
模型范围的选择要从我们的目标以及需要学习和交流的内容出发：制作模型是项有针对性的活动。
In this paper, Eighteen exercise objectives and their evaluation criteria are presented, including the method for choosing appropriate exercise objectives according to their group.
本文介绍了可供选择的十八项演习目标和各项目标的评价准则，同时介绍了分组选择演习目标的方法。
In this paper, Eighteen exercise objectives and their evaluation criteria are presented, including the method for choosing appropriate exercise objectives according to their group.
本文介绍了可供选择的十八项演习目标和各项目标的评价准则，同时介绍了分组选择演习目标的方法。
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