three core三心threenum.三n.三；三个adj.三个的Three-dimensional contour三维轮廓three-stage Clos networks三级Clos网络three industrial structures三次产业结构three-piece flare fitting三件式护口管接头three-stage steam ejector三级蒸汽喷射器three- dimensional design三维设计three-way telephoneWAPWAP三方通话three- core fiber coupler三芯光纤耦合器three problems in agricuhur三农问题Three combination structure三合模式