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'm going to miss all of you.
我会想念你们大家的。
Bye! Have a good day.
再见！请慢走！
I stopped and he asked me for a lift.
我把车停下，他向我提出要求搭车。