Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
How ofter have met with our competitors?
你多久遭遇我们的竞争对手一次？
Speak little of your ill luck and boast not of your good luck.
少说失意事，莫夸好运道。
The over-punctual can be as much a trial to others as the unpunctual.
早到的人同迟到的人一样令人讨厌。