古典的曲式结构形式之一。曲牌前后反复或变化构成“双叠”曲式。先后两叠称前叠、后叠,亦称上阕、下阕。本曲式在宋词的音乐中(如《满江红》、《扬州慢》、《大江东去》、《念奴娇》等)曾被广泛运用,以后在北曲中的《么篇》和南曲中的《前腔》中也都有采用。 Classical form of one of the forms. Tunes around or repeatedly form “double-fold ” music. Has said two stacks before the stack, after the stack, also known as Shang, Xia Shi. The song has been widely used in the music of the Song Dynasty (such as “Man Jiang Hong”, “Yangzhou Slow”, “Da Jiang Dong Go”, “Nian Nuo Jiao”, etc.) “Front cavity” are also used.