a dirty little street urchin的用法和样例：
- In this all behind, in fact hiding a dirty little secret.
- Even thouht he mirrored himself every day,he was still a dirty little pig.
- No one can have a higher opinion of him than I have; and I think he's a dirty little beast.
- As I'm putting on my pants suddenly I hear a commotion in the next room.The girl is bawling him out, calling him a pig, a dirty little pig.
- My children think that work is a dirty word!