Deleting a user, for instance, should delete his/her interests and ratings for answer relevancies, but not his/her contributions (questions and answers).

• 删除用户，例如，应该删除他/她给答案发表的“感兴趣”纪录和“顶”“踩”信息，但不要删除他/她发表的内容（问题和答案）。