Rcd
abbr. 剩余电流装置（residual current device）；路由控制数字（Route Control Digit）；接收机载波检测器（Receiver Carrier Detector）
🗣️ 情景例句
And the telephone number is five five five…three oh nine oh. Thank you.
电话是555-3090。谢谢。
To march in shingle file
排成一列前进
Goodbye.
再见。