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 thick hexagon nut六角特厚螺母extraterrestrial source地外源extra-record evidence案外之证据extra-metamathematics[计] 附加元数学Extravascular hemolysis血管外溶血Extrapancreatic effects胰腺外作用extrajudicial execution非法处决extrapyramidal symptoms锥体外系症状extralinguistic context语外语境extracellular recording细胞外记录