三维笛卡尔坐标系是在二维笛卡尔坐标系的基础上根据右手定则增加第三维坐标（即Z轴）而形成的。同二维坐标系一样，AutoCAD中的三维坐标系有世界坐标系WCS(World Coordinate System)和用户坐标系UCS(User Coordinate System)两种形式。
... t-bar joining the knees 毗连膝部中心环节关头的t型杆 three-dimensional reference system 三维坐标系 tappet body 液力挺柱体 ...
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...坐标变换，三维坐标系，图形学 [gap=675]Key words：transformation matrix, coordinate transformation, 3D coordinate system, computer ...
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Three-dimensional “H” point machine 三维‘H’点装置 Three-dimensional reference system 三维坐标系 three-point belt 三点式安全带 ..
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... hyperbola a 双曲线 asymptote e 渐近线 triaxial l coordinate 三维坐标系 ...
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其次有关波前面的描述和三维坐标系之间的变换也是个难点。
Moreover, it is difficult to implement a description of the wave front and the transformation of three-dimensional system of coordinates.
结果：建立了三维坐标系下的可从任意视角观察的颅颌面硬组织模型。
Results: The reconstructed image can be seen from an arbitrary viewing point.
前言： 目的建立用于全口义齿人工牙的三维坐标系并测量其相应参数值。
Objective:To establish three-dimension (3D) rectangular coordinate and to obtain relevant parameters of artificial tooth morphology for full denture.
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