Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
You've been very thoughtful.
你一直都很周到。
My watch is more expensive because it's a chronometer.
我的手表是精密型的，所以要比你的贵。
My aunt, Mrs flower, died three weeks ago.
我的伯母弗劳尔夫人3周前去世。