来自occasion,偶然。

1. She saw the occasional glimmer of a moth's wings.

她看见蛾子的翅膀偶尔会泛光。

2. An elegant occasional table is framed in the window.

一张雅致的供重大活动使用的餐桌被摆放在橱窗里。

3. The foggy streets were virtually empty, except for the occasional evening stroller.

除了偶尔一两个傍晚出来散步的人，雾蒙蒙的街上空荡荡的。

4. She flicked through a romantic paperback between occasional dips in the pool.

用在泳池里游一阵后歇一阵的几个空当，她翻完了一本平装本言情小说。

5. They have complained of discrimination and occasional rough treatment.

他们抗议遭受歧视，而且偶尔还会遭到粗暴的对待。