For instance, a sealed coffin was found at the site at Ma-wang-tui, which dates from 200 B.C., with two layers, one of plaster and one of coal, completely cutting off the outside air.
例如屬於公元前二百年的馬王堆遺址，發現一個兩層泥密封的棺木，一層石膏，一層碳，把裡外空氣完全隔絕。