Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
It's called
它的题目是
I know the boy whose father is a policeman.
我知道那个男孩的父亲是警察。
The lorry was loaded with empty beer bottles and hundreds of them slid off the back of the vehicle and on to the road.
卡车上装着空啤酒瓶。成百只瓶子顺势从卡车后面滑出车外落在马路上。