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
We have four people in the family, my parents, my elder brother and I.
我家有 4 口人，我的父母，我的哥哥和我。
An education enriches your mind.
教育能充实人的头脑。
Good, I'll invite you out when you're here.
好极了，等你来的时候，请再接受我的招待。