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And except for what's lost to friction, that angular momentum has to stay constant while the dancer is on pointe.
除了摩擦损耗的动量之外，当舞者踮起脚尖时 角动量必须保持不变。
On Pointe is a children's novel about an aspiring ballet dancer by Lorie Ann Grover, first published in 2004.
It was nominated for the 2006 Dorothy Canfield Fisher Children's Book Award.
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