Dihydrouracil
二氢尿嘧啶
🗣️ 情景例句
The little boy held his mother's hand firmly when crossing the street.
那小男孩过马路时紧抓着母亲的手。
I wonder what happened to him.
我不知道他出什么事了。
With this, he hurried off the stage.
他一边说着，一边匆匆下台。