乐曲中强弱音有规律地反复，叫作（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31703' and id < 2537934 and id<>'2537934' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31703' and id > 2537934 and id<>'2537934' order by id asc limit 5