This section shows you how to do this using a physical model and its objects. A similar approach can be used for logical models as well.
本节展示如何使用一个物理模型及其对象来实现这个目标——对于逻辑模型也可以使用类似的方法。
If a graphic designer primarily works on restaurant menus, she should be able to say how a menu can be used to push a specific dish, as well as details that have less to do with the design.
比如说作为一名主要为餐厅 设计菜单的平面设计师，她就应该具备向客户说明一份菜单如何才能用来推销某种特定菜肴的能力，说明的内容还要包含那些与设计不是很相关的细节。
Dispersants used by oil companies do not work well at or near freezing temperatures. Booms to contain a spill cannot be used with icebergs floating in the water.
石油公司使用的分散剂在接近冰点的温度下效果不佳，用于防止溢油扩散的栏油栅面对漂浮的冰山也无能为力。
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