anal agenesis

例句：

1. 1. The child's anal agenesis made him unable to defecate normally.
   孩子的肛门发育不全使他无法正常排便。
2. 2. The patient had undergone surgery to correct the anal agenesis.
   患者接受了手术来纠正肛门发育不全。
3. 3. Anal agenesis is a rare condition that can lead to severe complications.
   肛门发育不全是一种罕见的状况，可能导致严重的并发症。