external fin外肋externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物external superelevations外超高external pressure flange外压法兰external elastic laminae[医] 外弹性膜external pupil telescope外光瞳望远镜external pressure vessel外压容器external quality control外(部)质量控制external packing leakage端汽封漏泄external plexiform layer外丛状层external salivary glands[医] 外涎腺； 腮腺external groove sidevall外槽壁