Mdd
abbr. microgram per square decimeter per day 微克/分米/天（腐蚀速率单位）
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
The eye that sees all things else sees not itself.
眼睛能看见一切的东西，但看不见自己。
Get away from me!
离我远一点儿！