我正在尝试在我的项目中实现D3甜甜圈饼图，基本上 像this。
当数据数量为 很小，但是随着数据的增加和饼形变小，标签会重叠 使其无法读取，我的馅饼看起来像this。
如何制作标签 像this一样？
我的代码：
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