来自PIE*gras, 吞噬，吞食，词源同cress, voracity. 前面的gan为gren的韵律重复，参照gregarious.

1. The wound is festering, and gangrene has set in.

伤口在溃烂，已经生了坏疽。

2. Gangrene set in and he had to have his leg amputated.

他的腿生了坏疽，必须截除。

3. The wound was not properly disinfected and gangrene set in.

伤口未进行适当的消毒,开始生坏疽.

4. Once gangrene has developed the tissue is dead.

一旦出现坏疽，机体组织便已死亡。

5. Gangrene : Localized soft - tissue death ( necrosis ) from prolonged Blood - supply Blockage.

坏疽: 血液供应长期受阻所致的动物软组织局部死亡.