剑桥词典bleeding from the vagina that is not regular or normal and is not due to infection , pregnancy , or a tumour 功能失调性子宫出血 Dysfunctional uterine bleeding is usually caused by abnormal changes in hormone levels . 功能失调性子宫出血通常是由于荷尔蒙水平的不正常变化引起的。 返回 dysfunctional uterine bleeding