emptydocn.空文档(empty document的缩写)emptyadj.空的；空洞的；空虚的；空腹的v.倒空；变空；排空n.空物empty promises.空许诺。emptying aperture空孔Empty Trash on XX清空xx上的"废纸篓"(Y)empty hard capsule空心硬胶囊empty substitution空置换empty-lull steps虚实步态empty intersection空白(的)交叉empty nest elderly空巢老人empty-boxes test空盒检验empty flow of edge零流量弧