Ddh
abbr. diamond-drill-hole 金刚石钻钻孔; dichlorodimethylhydantoin 二氯二甲海因，二氯二甲基乙内酰胺
🗣️ 情景例句
And this is my sister Susan and her husband Harry Bennett
这是我妹妹Susan和她丈夫Harry Bennett
Do we have to wear the helmets?
我们得戴上防护帽吗？
He was a famous professor of physics.
他是一位著名的物理教授。