单词semimajor axis
un.: 半长轴
网络: 长半轴；半长径；半主轴
半长轴
But once you know the semimajor axis, you can immediately calculate, with equation five, the speed of the sandwich.
但是一旦你知道半轴长，你可以马上，用方程5计算出，三明治的速度。
Either half of the major axis is called a semimajor axis .
长轴的每一半叫做半长轴。
So that"s the reason why this semimajor axis is indeed such a horrendous number.
这就是为什么半长轴是，如此大的数字的原因。
Can we find out what the semimajor axis is?
能否算出，半轴长是多少？
A The ellipse has a semimajor axis A, -2a perigee to apogee-- is 2a.
椭圆轨道半长轴为，近地点到远地点。
Semimajor axis of beam cross-section
束流截面的长半轴