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
I want to keep the after-school programs--
我要保存这些课外活动--
I've never heard that piece before.Who wrote it?
我从来没听过那乐章，那是谁写的？
I hope you enjoy your stay with us.
希望您在这儿过的愉快。