Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
about us not having dinner with the family,
对于我们无法与全家人共进晚餐一事
I invited hime to come up, but he wouldn't.
我请他上来，但是他不肯。
Sure, I'll be glad to take care of it for you.
好的，没问题，乐于为你服务。