Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
I'll discuss this matter with you behind closed doors.
我要跟你私下谈这个事。
No pain, no gain.
不劳则无获。
They made no effort to hide their amusement whenever I produced a packet of sweets from my pocket.
每当我从口袋里掏出一包糖果时，他们都毫不掩饰地表现出他们对此感到非常好笑。