Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
I wish I had her energy.
我希望我有她那样的精力。
Oh, on! A ghost!
哇！有鬼呀！
He usually drops in at my place on his way home.
他常常在回家的路上顺便来看看我。