球面运动 meaning in English

spheric motion
spherical motion

So this paper bring forward several new concepts and new terms , and give the whole defmations to their physical meanings ; advance the conditions of right gearing mesh and continuous drive ; prove out that a pair of ring involute tooth forms are conjugated and that they can achieve precise spherical motion of constant transmitting ratio employing the space mesh theory
为此，本文首次提出了球齿轮传动中若干新概念，新名词，并对物理含义作了完整的定义；提出了球齿轮机构的正确啮合条件和连续传动条件；利用空间啮合理论，证明了一对渐开线环形齿廓互为共轭齿廓，能实现精确的定传动比球面运动。