单词：birth defect
birth defect的用法和样例：
例句
- Biliary atresia is a birth defect in which the bile ducts do not have normal openings, preventing bile from leaving the liver.胆道闭锁是一种不正常发育，使得胆管不能正常打开，导致胆汁不能离开肝脏产生作用。
- That is to say, before birth, certain hormones are deficient or their activity is impaired, and thus the typical development of the fetus toward maleness remains incomplete.就是说，在个体出生之前，某种激素缺乏或激素活性降低，因此胎儿向男性方向正常发育未完成。
- congenital defect先天性缺陷
- congenital abnormality先天性异常
- congenital disorder先天失常
- congenital anomaly先天性异常
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