The context diagram and the activity diagram are not necessary, but help you visualize the use case and its position in the project.
环境图和活动图不是必须的，但是可以帮助你可视化用例和它在项目中的位置。
As Figure 15 shows, the page boundaries are indicated in the outline view and on the process diagram, enabling you to position the elements of your process so that they don't fall on page boundaries.
如图15所示，大纲视图中和流程图上指示了页面边界，使您可以相应定位流程元素以使其不会落在页面边界上。
Each usually comes with a diagram, marking the position of the tiny specks of carbon that can be seen when viewed through a "loupe", the jeweller's 10x magnification tool.
每张通行证通常会配有一张图表，记录着钻石上微小的碳质瑕疵的位置，通过珠宝商特制的一种10x倍率的“放大镜”能看到这些瑕疵。
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