plastic things可數嗎

　　The stool had a torn, red plastic seat.

　　這條無靠背凳子有一個破了的、紅色的塑料坐部。

　　I was sitting on a wobbly plastic chair.

　　我當時正坐在一把搖搖晃晃的塑料椅子上。

　　She bent and picked up a plastic bucket.

　　她彎腰拎起一個塑料桶。