a gala occasion的用法和样例：
- He is the special guest on a gala occasion.
- The three-day festival is a gala occasion for the Dais with a variety of ceremonial activities.
- To the people of Hangzhou, Qiantang is the mother river and watching the tidal bore at its mouth is a gala occasion in their life.
- This is a gala occasion.
- A gala ball after the inaugural ceremony.
- She put on a gala reception party.