external N外源氮externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物external receptor外部感受器external currency在发行国境外的该国货币external piloting外部先导控制external auditory外耳道external immunity外部抗扰度external payments[经] 国外支付external resource外在资源external CD drive外置CD驱动器externally braced外撑的external rotation外旋转,外回旋,外转动,外回转