incidental

US /ˌɪn.sɪˈden.t̬əl/
UK /ˌɪn.sɪˈden.t̬əl/
"incidental" picture
1.

附带的, 偶然的, 次要的

happening as a minor accompaniment to something else

:
The discovery was incidental to their main research.
这项发现是他们主要研究的附带结果。
Any costs incurred will be purely incidental.
所产生的任何费用都将是纯粹的附带费用。