This operation creates a tapering of the workpiece via the use of a rotating hammer, which produces stepped columns and shafts of declining diameter.
这次行动创造了一个楔的工件通过使用旋转锤，生产，加强栏目和竖井下降的直径。
This operation creates a tapering of the workpiece via the use of a rotating hammer, which produces stepped columns and shafts of declining diameter.
这次行动创造了一个楔的工件通过使用旋转锤，生产，加强栏目和竖井下降的直径。
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