APP 由通过鼻下点Sn与鼻小柱相切的线同穿过Sn和上唇缘的直线形成的角大约100°A line is drawn from subnasion (Sn) tangent to the nasal columella. The line intersects the line passing through Sn and the upper margin of the upper lip. The angle is about 100° （共 222 字） [阅读本文] >>
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由通过鼻下点Sn与鼻小柱相切的线同穿过Sn和上唇缘的直线形成的角大约100°A line is drawn from subnasion (Sn) tangent to the nasal columella. The line intersects the line passing through Sn and the upper margin of the upper lip. The angle is about 100° （共 222 字） [阅读本文] >>
