资料来源：

https://www.google.com/url?sa=i&url=https%3A%2F%2Fstock.adobe.com%2Fsearch%3Fk%3Ddonut%2Bcartoon&psig=AOvVaw34uS8eSlezHykh6A2uBozx&ust=1694139144671000&source=images&cd=vfe&opi=89978449&ved=0CA4QjRxqFwoTCLjIraO2l4EDFQAAAAAdAAAAABAD

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