external aim外部的目的externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物external cavity laser diode外腔半导体激光器external interrrupt inhibit外部中断禁止位external gear shaper cutter外啮合插齿刀external security structure外围护结构External Tanks Corporations外挂油箱公司External Count-Down Clock外部倒计时钟external irradiation hazard外照射危害external combustion chamber外燃室,炉外燃烧室externally braced aeroplane外拉撑飞机external television cameras外部电视摄影机