### Chinese: 痛经主要是因为前列腺素的分泌，生理期刚开始还没来得及痛经时赶紧吃布洛芬可有效缓解当月疼痛，痛经开始后再吃没什么用。
### English: Dysmenorrhea is mainly due to the secretion of prostaglandins, the physiological period has not had time to eat ibuprofen when there is no time for dysmenorrhea can effectively relieve the pain of the month, and it is useless to eat after dysmenorrhea begins.

### Improved English: Dysmenorrhea is mainly due to the secretion of prostaglandins; Taking ibuprofen can effectively relieve the pain of dysmenorrhea that month before menstruation begins, but taking it is useless to after dysmenorrhea begins.
