牛以草为食。
For instance, several kinds of birds feed on insects flushed out of the grass by grazing cattle.
例如，几种鸟类以被放牧牛驱赶的昆虫为食。
Farm animals can also pollute water supplies. Animals like cattle, pigs, sheep and goats are often left to feed on grass in open fields bordered by streams or rivers.
农田动物也会污染水源。牛，猪，绵羊和山羊等动物通常在小溪或河边的广阔的草地上放牧。
Cattle like to feed on grass and grain.
牲口喜欢以牧草与谷物为食。
牛主要是吃草。
牛主要是吃草。
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