The open four-axis CNC system based on PC and motion control card can accomplish the cutting of various-angle welding plate.

并以基于PC和运动控制卡的开放式四轴数控系统实现支管端头的变角度焊接坡口面切割。

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This system has experienced the severe environment condition and has been used successfully in four-axis stable platform system.

新型高精度框架支承系统经受了恶劣环境条件的考验，已成功地应用于四轴稳定平台。

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So this is the time axis in seconds and we will cover four seconds.

这是以秒为单位的时间轴,我在这里画四秒。

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The probe was built with four reaction wheels and needs three of them -- one for each axis -- to aim its telescope precisely at a distant star, deputy project manager Charlie Sobeck said.

CNN: Planet-hunting Kepler spacecraft in trouble

Just as an example, note musical sketch from 2009 where comedy group Axis of Awesome amaze their audience by playing 36 modern pop songs over the same four-chord structure, in one long sequence.

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