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。

youdao

Normal face 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)。

youdao

Living through our teen years comes with all sorts of changes and adjustments, so it's normal to face some emotional ups and downs.

在青春期时，我们会经历各种各样的改变。因此，情绪起伏波动都是正常的。

youdao

Her overwhelmed mother pretends everything is normal, and the family refuses to face the problem.

VOA: standard.2010.07.22

The Y2K Cooperation Center warned that The Gambia's official computer systems could still face problems when normal work resumes after the new year holiday.

BBC: Gambia weathers Y2K risk

' They just want to have a normal face.

CNN: The story

The two men have yet to face off in anything resembling normal political circumstances, with no election furore or freakish mishaps.

ECONOMIST: Bagehot