grinding contact

例句：

1. 1.The grinding contact between the two machines is causing friction.
   两台机器之间的磨擦接触正在产生摩擦。
2. 2. The grinding contact between the teeth can cause wear and tear.
   牙齿之间的研磨接触会导致磨损和磨损。
3. 3. The grinding contact between the two surfaces is necessary for smooth operation.
   两个表面之间的研磨接触是平滑运行所必需的。