a fast crowd的用法和样例：
- They moved with a fast crowd, all of them young and rich and wild.
- He's not a fast horse but he's certainly a stayer.
- Bill has a feeling he is on a fast track.
- That new Fiat is a fast little number.
- Bill had a feeling he was on a fast track.
- He kept a fast hold on the rope.
a fast crowd的相关资料：