"During his days as a student," says Liu of Cheng, "he did hands-on work at archeological sites, digging up shards, observing, and in his mind recreating the process by which they may have been made. He has always had a naturally deep attachment to archeology."
「鄭永國從學生時代開始，就在考古遺址親自操刀，挖出碎片，一邊觀察，一邊在腦中模擬它的製作過程，他對考古自然有深刻的感情，」劉益昌認為，這樣的感情，讓他在復原史前陶的時候，會努力還原史前陶的精神，而不只是貌似。