凹三凸四什么意思？ 数学里上凹，下凹，上凸，下凸分别是什么4种
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“三凹”分别是两个眼睛之间，鼻额交界处必须是凹陷的；在唇珠的上方，人中沟是凹陷的，美女的人中沟都很深，人中脊明显；下唇的下方，有一个小小的凹陷，共三个凹陷。
凸四：第一是，额部。第二个，鼻尖。第三高，唇珠。第四高，下巴尖。
凹三：分别是两个眼睛之间，鼻额交界处必须是凹陷的；在唇珠的上方，人中沟是凹陷的，美女的人中沟都很深，人中脊明显；下唇的下方，有一个小小的凹陷，共三个凹陷。
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