(noun.) the act of shaping into parallel ridges and grooves.
(noun.) a ridge on a corrugated surface.
手打:莫林
双语例句
Another feature of the lock is the thin, flat keys with bevel-edged notchings, or with longitudinal sinuous corrugations to fit a narrow slit of a cylinder lock. 威廉·亨利·杜利特.世纪发明.