该方法在比赛区域建立二维平面坐标系，将整个航程划分若干区段，通过坐标轴旋转和平移得到各区段的虚拟坐标系。
A two-dimensional model for sailing was used to divide the voyage into several sections and obtain a corresponding coordinate system by a circumvolving and shifting operation.
通过引入三个坐标系的误差及其映射关系，从而得到含有误差的虚拟工件，为加工精度预测奠定了基础。
Synthesizing the errors given in the three coordinate systems in a proper way, the virtual parts containing errors are built up, which lays the foundation for machining accuracy prediction.
在嵌入阶段，我们指定了四个点来建立世界坐标系，以确保虚拟物体能够成功叠加到真实场景中的正确位置。
In the embedding step, four points are specified to build the world coordinate system so that the virtual objects are superimposed on the real scene images in the proper positions.
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