半正式的

例句：

1. 1. The dress is quite formal for the occasion.
   这件衣服对于这个场合来说相当正式。
2. 2. He prefers to wear casual clothes rather than formal ones.
   他更喜欢穿休闲服而不是正装。
3. 3. This restaurant serves a variety of dishes that are both formal and casual.
   这家餐厅提供各种既正式又休闲的菜肴。