### Chinese: 卫生巾最好两三个小时更换一次，不然容易滋生细菌，除去睡眠时间，最坏的情况是一天更换6次，每月7天，那就是42片，如果加上提前准备的份可能有50片，并不是每个月用一片。
### English: It is best to replace the sanitary napkin every two or three hours, otherwise it is easy to breed bacteria and remove sleep time. The worst case is to replace it 6 times a day, 7 days a month, that is 42 pieces<v>,</v> if you add the pre-prepared portion, there may be 50 tablets, not one tablet every month.
### Errors: There is a minor fluency/grammar error at "," within <v></v>.

### Improved English: It is best to replace sanitary pads every two or three hours, otherwise it is easy to breed bacteria; apart from sleep time, the worst case is to replace them six times a day, seven days a month, and that is 42 pieces; if you add the ones prepared in advance, there may be 50 pieces, not just one piece every month.
