atresia
閉鎖畸形
atre·sia /əˈtrɪʒə/ 名詞
閉鎖
A·tre·si·a n. Med. Absence or closure of a natural passage or channel of the body; imperforation.
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atresia
n : an abnormal condition in which a normal opening or tube in
the body (as the urethra) is closed or absent