如果物体通过几何变换而被放置在世界坐标系中，比如通过平移和旋转，那么视图跟踪他在世界坐标系中位置变换的轨迹可能会是一个艰难的工作。
If the object is positioned in the world through geometric transformations, such as translations and rotations, then keeping track of its position in world coordinates can be a hard task.
二维和三维图形的默认视图和场景应该让用户能够确定方向，而不需要太多的平移。
Default views of 2d and 3d diagrams and scenes should be such that a user can Orient himself without too much panning around.
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