happening in connection with sth else, but not as important as it
附带发生的；次要的◆We regarded the delivery service as incidental to our main business.
我们把送货服务作为主要业务的附带服务。◆You can claim up to €30 for incidental expenses (= small costs related to your main activity).
你能索回最高不超过 30 欧元的杂费。