资料来源：
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.istockphoto.com%2Fillustrations%2Fdonut-with-yellow-icing-on-white-background&psig=AOvVaw241bhRanWeLCItn2pSywlM&ust=1693968701416000&source=images&cd=vfe&opi=89978449&ved=0CA4QjRxqFwoTCMDI8667koEDFQAAAAAdAAAAABAw