A negative face has an outwardnormal pointing in a direction opposite that of the positive x-axis.
负向的外法线指向与正x轴相反的方向。
2
The touch point deviates eastward with respect to the central normal of the shock source, and the deviation Angle increases during the outward propagation of the shock system.
上述切触点相对激波源中心法线东偏，且东偏角度在激波系统向外传播过程中不断增加。
3
In contrast, low grade papillary tumors demonstrate densely arranged but normal-shaped small cells extending outward from fibrovascular cores.