periphery

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【词性】：n．

【释义】：

边缘，周围，边界

have an indistinct periphery边界欠清晰

periphery of the anus肛门周

periphery of the rectum直肠周

An anterior fontanelle obviously lower than the periphery is called sunken fontanelle．前囟比周围明显低凹，称为前囟陷下。