feed off
1．eat one's food from（a place，a dish，etc．）从…取得食物
The guests sat crosslegged around a low table and fed off a big plate．客人们围着一张矮桌子盘腿而坐，吃大盘子里的东西。
The pigs fed off the same trough．这些猪在一个食槽里吃食。
2．use as a source or supplier of food， materials，energy，etc．以…为食物、材料、能量等的来源
These little bears feed off the leaves of this special tree．这些小熊以这种特殊的树叶为食。
When fresh food and water are not available，the camel can feed off its hum．当得不到新鲜食物和水时，骆驼能以驼峰为养料的来源。
To avoid a power cut，they decided to feed off an alternative generator．为了防止停电，他们决定靠备用发电机发电。
Some bigger newspapers feed off reports in smaller papers．一些大报常采用小报的新闻报道。