Mdb
abbr. 元数据库（Meta Datase）
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
I have two suits to send to the cleaners.
我有2件西装送到洗衣店了。
Every year, several classes visit the factory.
每年都有好几个班去参观这家工厂。