off-topic
/ˈɒfˈtɒpɪk/adjective & adverb
- (especially of posts on an Internet message board) not relevant to the subject in question（尤指因特网留言板上所发的帖子）与主题无关的（地）; 离题的（地）：
as adj. his second comment is entirely off-topic他的第二条评论与主题完全无关
as adv. you're drifting off-topic.你有点跑题了。