acute vaginal bleeding的用法和样例：
- Uterine contractions and vaginal bleeding are suggestive of abruption.
- Conclusion The precipitating factors of vaginal bleeding should be avoided.
- Patient: I have had some vaginal bleeding for2 days, together with some pain in the lower abdomen.
- Patient: I have had vaginal bleeding for8 days beginning5 days after my last period ended.