1. 不平常的：off-island 外岛 | off-key 不平常的 | off-licence 卖酒执照
2. 不正常的：off-iron 等外生铁 | off-key 不正常的 | off-limitfile 隔离文件
3. (唱歌)跑调：query n. 询问 | off-key(唱歌)跑调 | off-track 唱错曲子
1. （音乐）走调的，不和谐的，不协调的
When music is off-key, it is not in tune.
e.g. ...wailing, off-key vocals and strangled guitars...
悲戚走调的歌声与哽咽的吉他声
e.g. No, no, no. This won't do. Someone is off-key.
不，不，不，这怎么行，有人唱走调了。