资料来源：
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.finedininglovers.com%2Farticle%2Fdoughnuts-without-yeast&psig=AOvVaw1dImaLofWbTfyOEKknxrc_&ust=1694046159804000&source=images&cd=vfe&opi=89978449&ved=0CA4QjRxqFwoTCNiavJLdlIEDFQAAAAAdAAAAABAD