血块

例句：

1. 1. He had a severe headache and was taken to the hospital for treatment.
   他头痛严重，被送往医院治疗。
2. 2. The doctor advised him to rest for a few days before starting his new job.
   医生建议他在开始新工作前休息几天。
3. 3. After the surgery, he stayed in the hospital for several weeks until the blood clot dissipated.
   手术后，他在医院待了几周，直到血凝块消散。