threepennyadj.三便士的；无价值的；便宜的threenum.三n.三；三个adj.三个的Three Mile Island nuclear plant还是核工厂three outlets of Jinjiang River荆江三口three-phase coordinate system三相坐标系Three -dimensional flow field三维流场Three-diamensional ultrasound三维超声three-line indica hybird rice三系杂交籼稻three types of throttling valve三种节流机构three-cave-nutrient-canal三腔营养管three-winding autotransformer三绕组自耦变压器three-dimensional solid model三维实体模型