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
Thanks for the invitation. And please give my regards to your wife.
谢谢你的邀请。请代我问候贵夫人。
From which station does the train leave?
这列火车从哪个站开出呢？
One had winter we watched the river creep up the lower meadows.
有一年冬天，天气不好，我们眼看着河水浸没了地势较低的草场。