"Dirty" is the Engpsh word for "脏的". You can use it to describe something that is not clean or is covered in dirt, grime, or other impurities. For example:
"This shirt is dirty. I need to wash it."
"The floor is dirty. Can you please sweep it?"
"The air in this city is dirty. It's not good for my asthma."
You can also use the word "filthy" to describe something that is extremely dirty or unsanitary. For example:
"This bathroom is filthy. It needs a good cleaning."
"The water in this river is filthy. I wouldn't drink it."