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posterior rugae /pɒstˈiəɹiə ˈɹuːɡiː/ n

中文：臀沟

中文 · 臀沟Español · pliegue analFrançais · raie des fesses
Meaning：Deep slender ridge between the two buttocks through which the anus opens.
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Found in these illustrated scenes（2）

Human body, posterior view Female rear view

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