As the ballerina extends and retracts her leg with each turn, momentum travels back and forth between leg and body, keeping her in motion.随着芭蕾舞者在每次旋转中伸缩她的腿，动量在下肢与身体之间来回转移，使她保持持续转动。

【芭蕾舞】天鹅湖 Swan Lake (1957) ...

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