名词
中文翻译：Unknown
同义词：
['asexual', 'sterile', 'infertile', 'barren', 'nulliparous']
例句：
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1. The couplehas been trying for several years to conceive a child, but they are still unable to have a baby.
这对夫妇已经尝试怀孕几年了，但仍然无法生育孩子。
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2.The researcher discovered that the female mice were sterile due to a genetic defect.
研究者发现雌性小鼠由于遗传缺陷而不孕。
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3.The doctor advised the couple to undergo fertility treatments if they wanted to conceive a child.
如果这对夫妇想生孩子，医生建议他们接受生育治疗。