Bds
abbr. 用硬纸板作封面（bound in boards）
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
Please send your report to me at the office by Monday.
请于周一以前将报告送到我的办公室。
What kind of quality control do you have?
你们用什么办法来控制质量呢？