non-diegetic
adjective theatre and film specialized uk/ˌnɒn.daɪ.əˈdʒet.ɪk/ us/ˌnɑːn.daɪ.əˈdʒet̬.ɪk/
非剧情性的，跟剧情空间无关的
Non-diegetic music in a film or TV programme is played over the action for the people watching to hear, rather than being part of the action and heard by the characters.