a chance acquaintance的用法和样例：
- I don't know what made me start confiding in her. She was a chance acquaintance,after all,someone I'd met on a train journey.
- Never chuck away a chance to improve your English.
- He has been burning for a chance to visit Beijing.
- She will never let slip a chance to study abroad.
- He'll talk your head off if you give him a chance.