friction measurement

例句：

1. 1.The engineer used a special tool to measurethe friction between the two surfaces.
   工程师使用一种特殊的工具来测量两个表面之间的摩擦力。
2. 2.In order to improve the performance of themachine, it is necessary to measure thefriction between the moving parts and the stationary parts.
   为了提高机器的性能，有必要测量移动部件和固定部件之间的摩擦力。
3. 3.The friction measurement is crucial for understanding thewear and tear of the materials.
   摩擦测量对于理解材料磨损至关重要。