在英语中，羊在牧场上被称为 "sheep on a pasture"。这个表达来源于古英语 "sceap"，意为羊，和 "paeture"，意为牧场。

下面是一些关于羊在牧场上的英文例句，以及它们的中文翻译：

The farmer tended to his sheep on the pasture.
(那个农夫在牧场上照顾他的羊。)
The pasture was lush and green, providing the perfect environment for the sheep to graze.
(牧场茂盛绿意，为羊提供了完美的放牧环境。)
The sound of the sheep on the pasture was soothing to the ear.
(牧场上羊的叫声舒缓着听者的耳朵。)

希望这些例句对你有帮助。