incidental
adjective uk/ˌɪn.sɪˈden.təl/ us/ˌɪn.sɪˈden.t̬əl/
次要的；附带的；伴随的
less important than the thing something is connected with or part of
Try not to be distracted by incidental details. 尽量不要为一些次要的枝节问题分心。
The points you make are true, but they're incidental to the main problem. 你的看法都正确，但它们对主要问题而言只是枝节性的。