Cdh
abbr. constant differential height 常微分顶点
🗣️ 情景例句
A gift from me.
这是我的一件礼物。
Fortune to one is mother, to another is stepmother.
命运对一种人如亲娘，对另一种人却是晚娘。
but we found that it traced its way through the trees.
没想到它到树林中继续向前延伸。