There are multiple ways to define a coordinate system for Earth coordinates; some are better for particular purposes than others.
有多种方式来定义地面坐标系统；有一些在某些用途方面比其他的更好。
The workpiece zero is the origin of the workpiece coordinate system. When the workpiece was set up on machining center, normally we need to define more than one workpiece zero.
工件零点是工件坐标系的原点，在加工中心上一次装夹需要设置多个工件零点。
The workpiece zero is the origin of the workpiece coordinate system. When the workpiece was set up on machining center, normally we need to define more than one workpiece zero.
工件零点是工件坐标系的原点，在加工中心上一次装夹需要设置多个工件零点。
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