cylindrical blade
... plain tube bank 光管束 plain vane 柱面叶片，圆柱形叶片 plain water 淡水 ...
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并针对叶片主干部分的椭圆柱面，分别推导其测地线和非测地线的微分方程序。
For the elliptic cylindrical surface which is the trunk of the blade, the geodesic and non-geodesic differential equations are deduced.
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