名词
中文翻译：直肠
同义词：
['anus', 'rectum', 'anal canal']
例句：
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1.He was diagnosed with rectal cancer and underwent surgery.
他被诊断出患有直肠癌并接受了手术。
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2.The patient had to be taken to the hospital for further examination.
病人需要被送往医院进行进一步检查。
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3. The doctor advised him to avoid spicy food and drink plenty of water.
医生建议他避免辛辣的食物，多喝水。