The music started, and everyone danced energetically on the dance floor.
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culture
Many Chinese learners encounter 劲舞 first through 《劲舞团》 (Jìngwǔtuán, 'Audition'), the rhythm-dance MMO game from Korean developer T3 that became a Chinese internet sensation around 2005-2010. The 劲 here is read jìng ('vigorous'), not jìn.