名词
中文翻译：Unknown
同义词：
['rectal valve', 'rectal flap']
例句：
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1. The patient's rectal gill was severely damaged during the surgery.
患者在手术中直肠瓣膜严重受损。
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2. The doctor performed a rectal gill repair on the patient.
医生为患者进行了直肠瓣膜修复手术。
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3. The patient had to undergo resection of the rectal gill due to cancer.
由于癌症，患者不得不切除直肠瓣膜。