自动外线对外线转移 Automatic Trunk-to-Trunk Transfer

红外线数字转速表 infrared digital tachometer

传式转换红外线光谱术 Fourier Transform Infrared Spectroscopy ; FTIR

外线转移外线 Trunk-to-Trunk Transfer

圆外旋转线 epicycloid

外线转接码 toegangscode voor buitenlijn ; outside line access code ; ulkolinjan valintanumero ; kod capaian talian luar

外线连接转接 Serial Call

外摆线轮系转动结构 epicycloidal gear-train

旋转红外线感应器 spin infrared sensor

话务台转接外线呼叫 External Call Transferred By The Operator