v.限制；划一条线包围；确定...的范围；画（几何图形的）外接圆
Do not circumscribe your study only in classes. 不要把自己的学习只局限于课堂。
A man should not circumscribe his activity by any inflexible fence of rigid rules. 人不应该将自己的行为限制在由僵化的条文构成的不可变通的范围之内。
First, it is always possible to circumscribe a sphere in a camera-aligned quad. 首先，它总能保证和一个与摄像机对齐的矩形相切。
