n.闭锁（畸形）；无孔；不通（如子宫，输卵管）

Example: The patient was diagnosed with biliary atresia, which is a congenital absence or blockage of the bile ducts.
病人被诊断为胆道闭锁，这是一种先天性胆管缺失或阻塞的疾病。
Example: A newborn baby may suffer from esophageal atresia, where there's a gap in her esophagus that doesn't connect it to the stomach properly.
新生儿可能患有食管闭锁症，即其食管存在缺口，未能与胃正常连接。
Example: Tracheoesophageal fistula and esophageal atresia are common congenital anomalies requiring surgery in neonates.
气管食管瘘和食管闭锁是新生儿中常见的需要手术治疗的先天性畸形。
Example: Atresia of the external auditory canal is a congenital condition where the ear canal is either underdeveloped or completely closed.
外耳道闭锁是一种先天性疾病，表现为外耳道发育不全或完全封闭。
Example: Duodenal atresia can be detected through prenatal ultrasound, often presenting as a 'double bubble' sign.
十二指肠闭锁可以通过产前超声波检测出来，通常会表现出“双泡征”。
Example: In some cases, vaginal atresia results in an obstructed menstrual flow and amenorrhea.
在某些情况下，阴道闭锁会导致月经流出受阻，引发闭经。
Example: Renal atresia, the complete absence or closure of one or both ureters, is a rare but serious birth defect.
肾盂输尿管连接部闭锁，即一条或多条输尿管完全缺失或闭合，是一种罕见但严重的先天性缺陷。
Example: Anal atresia is a birth defect where the anus is not open and requires surgical intervention for proper function.
肛门闭锁是一种出生缺陷，表现为肛门未开放，需要通过外科手术来实现正常功能。
Example: Congenital heart disease often coexists with other anomalies like tracheoesophageal fistula and esophageal atresia.
先天性心脏病往往与其他异常如气管食管瘘和食管闭锁共存。
Example: Choanal atresia refers to the narrowing or blockage of the back of the nasal passage, causing difficulty breathing.
鼻后孔闭锁是指鼻腔后部狭窄或阻塞，导致呼吸困难。