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The bottom of existing cookware is flat, but the flat shape is not conducive to the effective use of energy (Heat generated by fuel cannot stay at the bottom of the cookware for a long time. The flame will be blocked by the flat bottom and then quickly dissipated into air along the edge of the flat bottom). Sunken use sunken-bottom design, which allows the heat can accumulate at the bottom of the cookware. It can continuous heating food and greatly reduce the energy consumption and the cooking time.