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。
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.
武装人员在袭击之前，利用“Google地球”制作了袭击目标的三维模型，设计了最佳的进出路径、防守位置以及安全岗位。
Before the assault they had used Google Earth to explore 3-d models of the target and determine optimal entry and exit routes, defensive positions, and security posts.
不管你的目标是要制作一个台阶的垫脚石还是要制作一个其他形式的有关你的宠物的纪念品，制作爪子印模型都是一个一流个性化的主意。
Whether your goal is to create a stepping stone or some other form of keepsake related to your pet, creating a paw print mold is a way to personalize a one-of-a-kind item.
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