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 made it myself.
我自己做的。
What would you have done last night if you hadn't had to study?
如果昨晚你不必学习你会做什么？
Yes, I will.
是的，我会见到他。