正交错误控制，纵横错误控制 orthogonal error control 正交延伸 orthogonal extension 正交频率部门多任务 orthogonal frequency division multiplex，OFDM ..
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因有限元法对网格无正交性要求，因而可在椭圆变换前后进行剪切和延伸变换。
Since FEM has no such requirement that the grid line are of orthogonality, a sequence of shearing and stretching transformation, both prior to and subsequent to the elliptic mapping is used.
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