- orthogonal，正交投影；正射影，正射投影
orthogonal function 正交函数
orthogonal cutting 垂直切割
orthogonal polynomial 正交多项式
- projectionorthogonal projection 正投影，正交投影；正射影，正射投影
stereographic projection 球面投影；立体投影；球极平面投影；极射赤面投影
projection area [
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