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。
In this thesis, we define a coordinate system for the Drosophila brain.
在这篇论文里，我们为果蝇脑定义一个座标系统。
The workpiece zero is the origin of the workpiece coordinate system. When workpiece were set up on NC machine center, normally we need define more than one workpiece zero.
工件零点是工件坐标系的原点，在数控镗铣加工中心上，一次装夹需要设置多个工件零点。
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