grass為什麼不可數

因為grass，意思是草、草地，是不可數名詞，例如：

1、Flatten the surface of the grass with a roller.用碾軋機把草軋平。

2、The plant resembles grass in appearance.這種植物的外形像草。

3、You're not supposed to walk on the grass.不準踐踏草地。

4、The grass had withered in the warm sun.這些草在溫暖的陽光下枯死了。