perpendicular alignment

基本解释

A-3. Make sure the alignment device is perpendicular 90 degrees to the face, then through your impact.
收杆时须目视推杆瞄准线与打击面是否自然保持90度垂直，再收杆。
Sleeve axis is always perpendicular to railway sleepers, ensuring quick and accurate alignment. The average working efficiency is 1.5 times that of double end wrench.
套筒轴线始终垂直于轨枕面，对位快速、准确，平均工作效率为双头的1.5倍。
But the alignment and calibration of the optical axis and the electric axis of phased array radar demands high perpendicular accuracy of the optical axis to the array plane.
而相控阵雷达光电轴的标定与校准则要求光轴与阵面较高的垂直精度。