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[one-half]圆环图（也称为圆环）在功能上与饼图相同，但空白的中心和一次支持多个统计的能力除外。甜甜圈图表为标准饼图提供了更好的数据强度比，因为空白中心可用于显示其他相关数据。
[/one-half]
例子
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