a mangy trick的用法和样例：
- A bird is known by its note, and a mangy his talk.
- Tufts of wool hang from his shaggy sheepskin like a mangy dog.
- Daily practice is the trick in learning a foreign language.
- As the old man stares down at the threadbare carpet, a mangy dog chews at scraps under the kitchen sink.
- Theater students reading a script are oblivious to a mangy dog searching for his dinner.