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
Sorry, but she is with someone right now.
抱歉，她正在会客。
All your life you make many friends.
一生能结交许多的朋友。
Haven't you heard?
你没听说吗？