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汉语拼音：xiāng duì sù dù

物体相对于非地面参照系的速度。如甲、乙两列车以相同的速度同向行驶，则甲车相对于乙车的速度和乙车相对于甲车的速度都等于零；若反向行驶，则相对速度都等于二倍车速。

• This velocity is usually higher than the original speed of the projectile, and cannot be obtained in the test of stillness target.

  此相对速度比弹丸的初速高，利用静止靶进行试验，火炮无法达到此速度。

• The calculation of the collision probability in the case of the lower relative velocity was also discussed.

  简单讨论了低相对速度情况下碰撞概率的计算问题。

• Weather or not there is a rolling as well as rubbing motion, and the relative speeds of moving parts, also need to be considered.

  天气或不存在，以及滚动摩擦运动，和运动部件的相对速度，同时还需要考虑。

• A liquid drop removed from a sheet or jet may be exposed to the aerodynamic pressure effect of a high relative gas velocity.

  离开液膜或射流的液滴，可能会受到高的相对速度气体的气动压力影响。

• Rotation of the fiber bundle increases the relative velocity between the fluid and the hollow fibers and increases the mass transfer.

  该纤维束的旋转增加了所述流体与所述中空纤维之间的相对速度，并且提高了所述物质传递。

• We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed.

  我们坐在其中的一列火车上带着特制的速度测量仪，可以测出两列火车之间的相对速度。

• The paper discusses the method of determinating the cam profile, with roller or plat-faced follower, by means of instantaneous centers.

  本文研究用相对速度瞬心求滚子从动杆和平底从动杆凸轮实际轮廓的方法。

• This method established is applicable to collision probability problem involving relative velocity and error covariance changing with time.

  所建立的这种描述和计算方法适用于相对速度和误差协方差矩阵随时间任意变化的情况。

• City Safety uses a laser sensor fitted behind the windscreen to scan the road ahead, calculating relative speeds and distances.

  “城市安全”使用一个安装在挡风玻璃后的激光传感器扫描前方路况，实时计算相对速度和距离。