semi-axis的音标

Non-linear equations are ( constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.

以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。

Two pairs of point on the ellipse are used to determine the location of the center of the ellipse, orientation, and the two semi-axis.

用椭圆上的两对点确定椭圆的中心、旋转角度、长半轴、短半轴等参数。

For 45# steel car semi-axis, through determining its chemical components, microstructure, hardness, inclusion, observing the breaking section and analyzing its heat treat process, the main reason for its break is found out, the improving measures proposed.

通过检验45钢汽车半轴化学成分、金相组织、硬度、夹杂物，观察断口形貌及分析其热处理工艺，确定了造成汽车半轴断裂的主要原因，继而提出了改进措施。