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 circum-circle空外接圆Empty- Nest Elderly空巢老人empty-nest syndrome空巢综合征empty stack exception空栈异常empty core plate beam空心板梁empty gelatin capsule空明胶胶囊empty-nest families空巢家庭empty car kilometrage空车公里Empty cars adjustment空车调整emptycar distribution空车调整