这件青铜鼎开了个小门

Group 1 - The article discusses the ancient Chinese heating device known as the "Wending," which was used to warm food during winter [3][4] - The Wending features a unique design with a small door on its body, allowing for flexible opening and closing [4] - Inside the Wending, there is an independent hollow furnace chamber where burning charcoal can be placed, transferring heat to the upper container to warm food [4]