Extonn.埃克斯顿EXTabbr.扩展（=extension）abbr.外面的；外部的（=exterior）abbr.额外的（=extra）extopic expression强制性表达extrimum principle极值原理extirpated species绝迹种(动)extrution enhanced挤压强化extrudate swelling挤出物膨胀extremitas uterina子宫端extensible surface可展曲面exterir ballistics外弹道extemal evaluation外部评估Extremities artery肢体动脉