Cdh
abbr. constant differential height 常微分頂點
??? 情景例句
when Molly gave him the injection.
Molly給他打針時。
Because of the type of purchase, we can only ship by road.
由于商品的性質，我方只能使用公路運輸。
As soon as I went outside, I forgot all about Madam Bellinsky because my wife hurried towards me.
我一走出帳篷，就把別林斯基夫人給算卦的事忘得一干二凈了，因為我的妻子正匆匆向我跑來。