dirty可數嗎?

　　We painted over the dirty marks on the wall.

　　我們把墻上的臟印子用油漆蓋上了。

　　Terry crammed the dirty clothes into his bag.

　　特里把臟衣服塞進了包里。

　　Dirty hands can be a breeding ground for germs.

　　臟手會滋生病菌。