食物来源的英文：
food supply ;source of food

参考例句：

The attractiveness of laboratory-grown microbes as a food source for predators such as soil protozoa
实验室微生物作为捕食者(如土壤原生动物)的食物来源

"It is an endangered species, owing to the loss of its main source of food, the prairie dog."
由于主要食物来源－－草原犬鼠已几乎消失，所以被列为濒危种。

food是什么意思：
n. 食物，食品；养料

Will this food keep?
这食品能放得住吗？

They are famishing for food.
他们因缺乏食物而正在挨饿。

Do you know where to buy dog food, rabbit food, and cat food?
你知道在那里买狗粮，兔粮，跟猫粮吗？

supply是什么意思：
v. 供给，供应；补充
n. 供给，供应；供应量，供应品；生活用品；生活费
adv. 柔韧地

Demand exceeds supply. The supply is not adequate to the demand．
供不应求

Furnish a village with supplies/furnish supplies to a village
供应某村庄生活用品

air-supply register
空气供应记录器

source是什么意思：
n. 来源，出处；原始资料；原因；发源地

They are trying to trace the source of the trouble.
他们正设法找出这件麻烦事的起因。

Where is the source of the Nile?
尼罗河发源于何处？

Is the water polluted at source?
河水是在源头受到污染的吗？