在大自然中，有的鱼以死鱼为食。

Some fish scavenge on dead fish in the wild.

《牛津词典》

蝴蝶以园林中草木的花为食。

Butterflies feed on the flowers of garden plants.

《牛津词典》

毛虫以各种树木、灌木丛和植物为食。

The caterpillars feed on a wide range of trees, shrubs and plants.

《柯林斯英汉双解大词典》

And indeed, it's expressly stated by God that Humans are to be given every fruit bearing tree and seed bearing plant, fruits and grains for food.

而上帝也确实这样表述过,人们能拥有所有结果的树，结籽的植物，以果实和稻谷为食。

耶鲁公开课 - 旧约导论课程节选

For four days, the three of them fed on the body and blood of the cabin boy.

整整四天，他们三个,靠派克的尸体和血液为食。

耶鲁公开课 - 公正课程节选

Was there not even a cook in his Army?

亦有人为其烹食饮马

耶鲁公开课 - 1871年后的法国课程节选