n.[U]

1. 食物，粮食；营养（品）
   We derive our sustenance from the land.

   我们从土地获取食物。

2. 生计
3. 支持，维持，供养
   Due to the lack of food, they relied upon gruel for their sustenance.

   因为缺乏食物，他们依赖喝粥维生。

n.

1. food and drink regarded as sustaining life.
2. the sustaining of someone or something in life or existence.