gangrene of colon

例句：

1. 1.The patient's leg was gangrenous and had to be amputated.
   患者的腿坏疽了，不得不截肢。
2. 2. The wound was infected and required immediate care to prevent gangrene.
   伤口感染了，需要立即处理以防止坏疽。
3. 3. The patient's condition worsened quickly, leading to the fear of gangrene.
   患者的病情迅速恶化，引发了坏疽的担忧。