threefoleadj.三倍；增加二倍；三重的；三方面的；三次adv.三倍；增加二倍；三重地；三方面的；三次threenum.三n.三；三个adj.三个的three-island vessel三岛形船Three Gods in one God在一位神中有三位神three spheres theorem三球面定理three-level package[计] 三级组装three interacting jet三作用射流three parallel rivers“三江并流”three-pointlighting三点照明three-in-one cell三试件压力室three-range winding三列绕组three-state network三端口网络