双面剃须刀比可抛弃型剃刀寿命长的多。
A double edged razor will last a lot longer than disposable razors.
加工中心备有刀库，具有自动换刀功能，是对工件一次装夹后进行多工序加工的数控机床。
Processing center for tool store, have automatically change the tools function, the workpiece is a fixture on the processing process to the numerical control machine.
从提高自由曲面数控加工精度入手，对多轴数控加工的误差进行了分析，并提出了较为合理的走刀步长的估算方法。
In order to improve the precision of freeform surface, the error of multi-axis NC machining is analyzed and a more reasonable estimate for tool step is given.
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