extra fee额外费用extraadj.额外的n.额外之物；临时演员adv.特别地extracorporeal circulation capital体外循环资金extramembranous glomerulonephritis膜外肾小球肾炎extralobar pulmonary sequestration叶外型肺隔离症Extraperitoneal surgical treatment腹膜外途径extracurricular listening practice课外训练Extra large Big Shopping basket.额外大购物篮。extragalactic background radiation河外背景辐射extracellular polymeric substances胞外聚合物extrame-low altitude penetration超低空突防extrapolation of harmonic analysis谐波分析外推法