Abdominal friction rub的用法和样例：
- The fibrin often results in the the finding on physical examination of a "friction rub" as the strands of fibrin on epicardium and pericardium rub against each other.
- Likewise, the stethoscope allows the examiner to detect mid systolic clicks in mitral valve prolapse and pericardial friction rubs.
- To wear down or rub away by friction; erode.
- Give the table a good rub with this polish.
- Please give the table a good rub with this cloth.