subfertility

The Cause and Regulative Factors in the Subfertility of High-producing Dairy Cows

高产奶牛繁殖障碍的起因和调控因素

Intrauterine insemination with controlled ovarian hyperstimulation versus expectant management for couples with unexplained subfertility and an intermediate prognosis: a randomised clinical trial

不明原因生育能力低下且妊娠预测为中等水平的夫妇在控制性超排卵下的宫内人工受精与期待疗法的疗效比较：一项随机临床试验

It may take a couple longer than a year to conceive--a problem known as subfertility--or they may not succeed at all.

一对夫妻可能要花一年以上的时间才能怀上孩子——这被称为“弱育”（subfertility）问题——他们甚至还有可能根本就怀不上。

It may take a couple longer than a year to conceive a problem known as subfertility or they may not succeed at all.

一对夫妻可能要花一年以上的时间才能怀上孩子这被称为弱育（subfertility）问题他们甚至还有可能根本就怀不上。