square work
... 方形发动机 square engine; 方形工件 square work; 方形沟 drain; ...
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车方机床用曲率半径很大的椭圆短半轴曲线代替直线切削方形工件。
It illustrates a ellipse's short semi-axial curved line with great cured radius, that can replace the straight line for cutting square work-pieces on the machine tool.
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