a.

1. 偶尔的，非经常的
   She likes an occasional glass of wine.

   她喜欢偶尔喝杯酒。

   He pays me occasional visits.

   他偶尔来看我一次。

2. 特殊场合的，应景的[B]
   Occasional music was played at the graduation.

   毕业仪式上演奏了庆典的音乐。

3. 临时的
   Upon a little occasional table was a tray with breakfast things.

   在一张临时用的小桌子上放着一个盛着早餐及餐具的盘子。

adj.

1. occurring infrequently or irregularly.
2. produced on or intended for particular occasions:
   occasional verse.