hemorrhage of lower digestive tract

例句：

1. 1. He was bleeding from his nose whenhe fell down the stairs.
   他摔下楼梯时鼻子流血了。
2. 2. Thedoctor said that she hada severe case of appendicitis and needed to have surgeryimmediately.
   医生说她得了阑尾炎，需要立即手术。
3. 3. Blood loss is a commonside effect of surgery.
   手术后出血是常见的副作用。