- internal circular planing
- 刨: dig; excavate
- 圆孔: a round hole
- 法: law
- 圆孔: annular opening; circular aperture; circular hole; circular orifice; foramen rotundum; foramenrotundum; foramina rotundum; rotundum foramen; round foramen; round hole; round orifice; roundhole
- 穿孔法: testing methods for shear strength of plastics by punch tool
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