A negative face has an outward normal 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
Normalface perception is just picking up on the melody of faces while people with prosopagnosia generally lack this ability (although to different degrees).
通常的脸部识别就像是在逐步熟悉脸部旋律，而面容失忆症患者一般就缺少这种能力(尽管程度不同)。
3
Living through our teen years comes with all sorts of changes and adjustments, so it's normal to face some emotional ups and downs.