Yongzuo Liwu shangci de Dingzi yao : Qing qianqi de yaowu zhishi jiqi zai zhengzhi changyu zhong de yunzuo shen luo 用作禮物賞賜的錠子藥：清前期的藥物知識及其在政治場域中的運作脤絡 = The Dingzi Drug as Gift: Its Medical Knowledge and Political Uses in the Early Qing Dynasty