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 **用户分层**是指将用户按照行为、人口学分布、地理位置等等因素做出区分的方法。[^mixpanel]
 
-[mixpanel]: https://mixpanel.com/blog/2018/05/09/user-segmentation-guide-understanding-customers/
+[^mixpanel]: https://mixpanel.com/blog/2018/05/09/user-segmentation-guide-understanding-customers/