N an instrument resembling a carpenter's brace and bit formerly used to remove circular sections of bone (esp from the skull) 环锯 [surgery] → compare trephine
V to cut (a hole or groove) with a trepan 用环锯造(孔或槽)
N（名词） an instrument resembling a carpenter's brace and bit formerly used to remove circular sections of bone (esp from the skull) 环锯 [surgery] → compare trephine
V（动词） to cut (a hole or groove) with a trepan 用环锯造(孔或槽)