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
Can what?
能做什么？
A true friend is known in the day of adversity.
疾风知劲草，患难知友情。
Oh, I usually come on foot.
噢，我常步行来。