早期肺动脉瓣狭窄是一种可能的原因，因为假如狭窄出现的很早，右心室就不能发育，从而出现发育不全。
Early pulmonary stenosis is a possible cause because when the stenosis develops early, the right ventricle does not develop, and the right heart becomes hypoplastic.
早期肺动脉瓣狭窄是一种可能的原因，因为假如狭窄出现的很早，右心室就不能发育，从而出现发育不全。
Early pulmonary stenosis is a possible cause because when the stenosis develops early, the right ventricle does not develop, and the right heart becomes hypoplastic.
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