sheep的意思是“羊,绵羊”,是可数名词，单复数同形。
sheep：n.羊;绵羊
例句：
The island is populated largely by sheep.
这个岛的主要生物是绵羊。
The minister preached a sermon on the parable of the lost sheep.
牧师讲道时用了亡羊的比喻。
The first task was to fence the wood to exclude sheep
第一项任务就是把树林围起来不让羊进去。
I'd kinda like to have a sheep farm in New Mexico
我有点儿想在新墨西哥州开一个牧羊场。
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