来自incident,偶发事件，发生。引申词义偶然的，附带的。

1. The discovery was incidental to their main research.

这一发现是他们主要研究中的附带收获。

2. Keep this money for your incidental expenses.

这点儿钱,你留着零花吧.

3. At the bottom of the bill, you will notice various incidental expenses such as faxes.

在账单底部，你会发现有传真等各项杂费。

4. We were able to stick to the main issue without incidental grievances being dragged in.

没有了附带扯进去的牢骚话，我们就能够紧扣主题。

5. The playing of music proved to be incidental to the main business of the evening.

音乐演奏成了当晚唱主角的商业活动的陪衬。