extra tea顶上嫩茶extraadj.额外的n.额外之物；临时演员adv.特别地extracurriculum activities课余生活extraterrestrial trajecory行星际轨迹extracellular glycoprotein胞外糖蛋白Extracorporcal circulation体外循环extrachromosomal nucleolus游离核仁extracellular triterpenoids胞外三萜extra-long railway tunnel特长铁路隧道extraheptic biliary atresia肝外胆管闭extracranial encephalometer颅外测脑器extra-budgetary resources预算外资金