frequency identification 基本例句 频率识别 The roots of radio-frequency identificationtechnology stretch at least as far back as World War II, when transponders helped distinguish between Axis and Allied aircraft.无线频率识别技术的最早运用可以追溯到第二次世界大战,那时无线电发射机应答器帮助人们分辨轴心国和同盟国的战机。