extra old特等陈年威士忌酒
extraadj.额外的n.额外之物;临时演员adv.特别地
extra-heavy crude oil超重原油
extrapleural oleothorax胸膜外油胸
ExtraceUular proteinase胞外蛋白酶
extrachromosomal factor染色体外因子
Extraterrestrial impact地外物体撞击
extraterrestrial signal地外信号
extrados springing line拱外弧起拱线
extracellular chitinase胞外几丁质酶
extraembryonic mesoderm胚外中胚层
extrapolation technique外推法