### Chinese: 流的并不只是血，其中包含脱落的子宫内膜。
### English: It wasn't just blood that was flowing, it contained the shed lining of the uterus.
### Errors: There is a major error of incorrect translation includes information not present in the correct translation at "the shed lining of the uterus". There is a minor error of incorrect translation has stylistic problems at "It wasn't just blood that was flowing".

### Improved English: It’s not just blood, but also endometrium that fall off.