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
Ready?
准备好了吗？
Fortune knocks once at least at every man's door.
人人都有鸿运高照之日。
Everyone has something to sell.
人人都有东西可以出售。