磨圆度 psephicity ; degree of rounding

斜面外磨圆床 angular approach cylindrical grinding machine

磨圆夹具 Cindrical grinding attachment

依天然形状磨圆的宝石 cabochon

磨圆的 rounded

磨圆好的 well-rounded

磨圆度差的 poorly rounded

外圆磨床 [机] cylindrical grinding machine ; [机] cylindrical grinder ; circular grinding machine ; external grinder

球磨圆石 crushing boulders

外圆磨削 externing grinding ; Auß