adjective · The central theme or dominant idea of a discussion, era, or event.

和平与发展是当今时代的主旋律。

adjective · Artistic works, particularly films, created to promote official government or Party values and perspectives.

这部主旋律电影在票房上取得了巨大的成功。

adjective · The principal melody or musical theme of a composition.

这首交响乐的主旋律非常优美。