The principle straightness error of cutting square in work-pieces can be controlled by choosing a suitable pitch diameter of the planetary gear in the machine tools.

选取适当的车头行星轮的分度圆直径，可以有效地控制车方原理的直线度误差。

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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.

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。

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If you visit during Mule Day celebrations, you might see mule-driving contests, square dances, horn shows, or even tree cutting competitions.

如果你在骡日庆祝活动期间来访，你可能会看到赶骡比赛、广场舞、号角表演，甚至是砍树比赛。

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Eight overs later, de Villiers completed his fine 108-ball ton by cutting Daren Powell between backward point and square cover for four.

BBC: CHOOSE A SPORT

As I explained at the time, that one decision almost took the government back to square one when it came to cutting the structural deficit.

BBC: Hard times for Mr Osborne

The new gallery for changing exhibitions on the third floor provides the Museum with its first completely flexible space for presenting cutting-edge new projects, with 4, 100 square feet of unencumbered space.

ENGADGET: Museum of The Moving Image plans multi-million dollar updates with HD, 3D