Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
Oh, I forgot.
噢， 我忘了。
I'm on my way.
我这就上路。
Then the woman simply took the parcel and walked out of the shop without paying.
然后，那妇女拿过包就走出了商场，根本没有付钱。