Mdr
abbr. 日最低需要量（Minimum Daily Requirement）；存储数据寄存器（Memory Data Register）；多路数据记录器（Multichannel Data Recorder）
🗣️ 情景例句
I have worked hard at my major subject.
我对主修课特别用功。
Joy and sorrow are next-door neighbours.
是喜是忧难以分。
Sure. We were in the same class.
当然认识。我们同班呢。