Rbd
abbr. rapid beam deflector 快速波束偏转器; required beginning date 必需的初始日期; right border of dullness 右浊音界（心脏叩诊）
🗣️ 情景例句
I don't understand.
我不懂你在讲什么。
May I use your telephone?
我能用你的电话吗？
Where did you put it?
你把它放哪儿啦？