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Traditional toaster width is limited to only toast, there are many practical limitations on other types of bread can not be heated. That the use of an oven heating, it can not be double-sided heat evenly. For example: bagels , a thick bread, croissants and so on.
National Dong Hwa University
Hualien County, Taiwan
Chia-Ling,Hsu Sih-Rong,Cheng Hsin-Ya,Shih