big long shot的用法和样例：
- It's a long shot but I think John must have stolen the bike.
- It's a long shot, but I should say she's about forty.
- Looking for her in the library was a long shot; I had no idea where she was.
- Mr. A is a nice man with a big heart, but he is a long shot in business sales.
- A funny face with big long ears.