external lip外唇externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物external corner reinforcement外墙护角external window air tightness外窗气密性externally powered prosthesis外部动力假肢external characteristic curve外特性曲线external device communication外部设备通信external common tangent plane外公切面external alternator regulator外装交流发电机调节器external intercostal membrane肋间外膜external urethral meatus cyst外尿道口囊肿external fixation of fracture骨折外固定