A case of the crabs的用法和样例：
- It is a case of the student outstripping the teacher.
- We reported a case of GS of the uterine cervix.
- The contract went to a friend of the chief accountant: it's (a case of) you scratch my back and I'll scratch yours.
- This is a case of the biter bit with a vengeance.
- Judge or juror favour one of the parties in a case.