Ddm
abbr. 调制深度差（Difference of Depth of Modulation）；分布式数据管理（Distributed Data Management）
🗣️ 情景例句
It was on his birthday, June second, two years ago.
是在他生日那天。两年前的六月二日。
They teach you English in an intensive course lasting just a week.
他们用一周的时间教速成英语课程。
What?
什么？