(椭圆的)长轴;
An ellipsoid name , semi-major axis, and inverse flattening.
参考椭球体, 椭球半长轴和.
The stack has a major axis and two end faces.
该叠层具有主轴线和两个端面.
Either half of the major axis is called a semimajor axis.
长轴的每一半叫做半长轴.
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