semi-major axis 长半轴 ; [天] 半长径 ; 长半径
semi major axis 长半径 ; 半长同
major axis of cam [机] 凸轮长轴
major axis of flexspline [机] 柔轮长轴
Major axis pressing 顺血管长轴压迫法
semi-major axis of satellite orbit [航] 卫星轨道长半径
angular semi-major axis [天] 角半长径
The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
第三定律（周期定律）：各个行星绕太阳公转周期的平方和它们的椭圆轨道的半长轴的立方成正比。
Then avoid the surge vibration of the major axis manufacture.
加工细长轴时，工件易产生自激振动。
Then, based on the generalized method, a modified method using adjusted semi major axis is presented.
提出了一种长半轴加修正的队形设计新方法。
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