n.（带血）黑粪（症）；黑色呕吐物

The patient complained of dark, tarry stools, which is a sign of melena.
病人报告有黑色、粘稠的大便，这是黑便的迹象。
She was diagnosed with melena after a colonoscopy revealed bleeding in her lower intestines.
在结肠镜检查显示她的下消化道出血后，她被诊断为患有黑便。
Melena can be a symptom of a serious underlying condition like colorectal cancer.
黑便可能是结直肠癌等严重疾病的症状。
The doctor prescribed medication to stop the melena and recommended regular check-ups.
医生开药以止住黑便，并建议定期复查。
She noticed her toilet paper turning black, indicating the presence of melena.
她发现卫生纸变黑，这表明她可能有黑便。
Her anemia improved significantly after treatment for the melena.
治疗黑便后，她的贫血状况有了显著改善。
In infants, melena could be a sign of a digestive tract obstruction or bacterial infection.
对于婴儿来说，黑便可能是肠道阻塞或细菌感染的迹象。
The nurse monitored the patient's bowel movements carefully, looking out for any signs of melena.
护士密切观察患者的排便情况，以防出现黑便的迹象。
If you experience melena along with abdominal pain or fever, seek medical attention immediately.
如果你同时伴有腹痛或发热，应立即就医，因为这可能是黑便的危险信号。
It's important to differentiate between melena and hematochezia, as they have different causes and treatments.
区分黑便和血便很重要，因为它们的原因和治疗方法不同。