这些羊在吃草。
羊吃的是草。
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。
Sheep mainly feed on grass, which is plenty here.
羊主要以草为食物，而草在这儿是非常充裕的。
羊以食草为生。
Thee teacher said: "If the shepherd put twenty sheep out to feed on the grass in a field, five of them jumped a fence, how many sheep would be left?"
老师说：“如果牧羊人把20只羊放到牧场上去吃草，有5只羊跳出了围栏，还会剩下多少只？”
The sheep feed chiefly on grass.
羊主要以草为食。
羊主要吃草。
The teacher said: "If the shepherd put twenty sheep out to feed on the grass in a field, five of them jumped a fence, how many sheep would be left?"
老师说：“如果牧羊人把20只羊放到牧场上去吃草，有5只羊跳出了围栏，还会剩下多少只？”
Sheep , cows and horses feed freely on the green grass and the forests around are home to lots of birds and animals.
羊、牛和马自由地以绿草为食，周围的森林是许多鸟和动物的家园。
Sheep, cows and horses feed freely on the green grass and the forests around are home to lots of birds and animals.
牛、羊和马自由自在地吃着青草，周围的森林就是众多鸟儿和动物的家园。
Sheep, cows and horses feed freely on the green grass and the forests around are home to lots of birds and animals.
牛、羊和马自由自在地吃着青草，周围的森林就是众多鸟儿和动物的家园。
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