negative variation

• 负变,负变分,负变差

negative variation的用法和样例：

例句

1. By designing the negative shift for the sprocket, its trajectory coincides with the theoretical one, and the meshing quality is improved.
   通过对链轮的负变位设计，使运动轨迹与理论轨迹重合，提高了啮合质量，并对啮合的重合度作了分析计算，对重合度的选择提供了依据。