Oral birth control pills contain hormones that prevent ovulation and reduce the severity of menstrual cramps.

口服含激素的药片会阻止排卵和降低痛经的严重度。

youdao

Oral birth control pills contain hormones that prevent ovulation and reduce the severity of menstrual cramps.

口服含激素的药片会阻止排卵和降低痛经的严重度。

youdao