extra fee额外费用extraadj.额外的n.额外之物；临时演员adv.特别地extrahepatic cholestatic jaundice肝外胆汁淤滞性黄疸,肝外阻塞性黄疸extracelluar polymeric substances胞外聚合物（EPS）extra-high voltage model system超高压模型系统extracurricular sports activities课外体育活动extra-large deep foundation pit超大深基坑Extracoronal buffered attachments缓冲型冠外附着体extra-corporeal liver perfusion体外肝灌注extrahepatic obstructive jaundice肝外阻塞性黄疸extrathyroidal neck radioactivity甲状腺外颈部放射性, 颈部甲状腺外放射活性extravagate from the right course偏离正道