a-side

n.

a line spoken by an actor to the audience but not intended for others on the stage

同义词：aside

a message that departs from the main subject

同义词：digressionasideexcursusdivagationparenthesis

1. The band's latest single has a great A-side that's been playing on the radio all week.
   这支乐队的最新单曲的A面非常棒，整个星期都在电台播放。
2. The A-side of the record features their hit song.
   唱片的A面收录了他们的热门歌曲。