extra tea顶上嫩茶extraadj.额外的n.额外之物；临时演员adv.特别地extra large capacity motor超大型电机extra - low carbon steel超低碳钢extraosseous ameloblastoma骨外成釉细胞瘤, 骨外造釉细胞瘤extracampine hallucination感觉域外幻觉extra-amniotic pregnancy羊膜外妊娠extramammary Paget disease畸形性骨炎, 乳房外佩吉特病extraterrestrial radiation地外辐射,行星际辐射extrapolation to the limit外推极限法extra-high tensile steel特高强度钢extra deep-drawing steel极深冲钢,优质深冲钢