grass既是可数名词也是不可数名词，grass（不可数名词）：草，草地；grasses表示多种类的草；grass（可数名词）：告密者，揭发者。grass作草、草地、牧场解时多用作不可数名词，而作“禾本科植物”解时多用作可数名词。
相关介绍
例句：The grass was wet with dew.
草被露水打湿了。
Father was cutting the grass, and meanwhile mother was planting roses.
父亲在剪草,母亲在种玫瑰。
We play football on the grass.
我们在草地上踢足球。
I let the horse drop his head to crop the spring grass.
我让马低下头啃吃春天的青草。
The windows overlooked a lawn of tall waving grass.
窗户外边是一块草地，高高的草随风摇摆。
Mr Zuma had a solid reputation as a grass roots organiser.
作为一个民众的组织者，祖玛先生名声甚佳。
