extraneous
/ɪkˈstreɪnɪəs; ɪk`strenɪəs/ adj
~ (to sth)
1 not belonging to or directly connected with the subject or matter being dealt with 与正题无关的
extraneous information 无关的消息
extraneous material in a book 书中的题外资料.
2 coming from outside 来自外部的; 外来的
extraneous interference 外来的干涉.