1、The philtrum is the vertical groove between the base of the nose and the border of the upper lip.
鼻唇沟是位于鼻底和上嘴唇边缘之间的垂直沟槽。
2、When a person feels emotions such as excitement or arousal, blood flow to the philtrum region can increase.
当人们感受到兴奋或激动等情绪时，鼻唇沟区域的血流量会增加。