Usea nitrogen
[医] 脲氮, 尿素氮
🧩 词语组成解析
[医] 脲, 尿素
🗣️ 情景例句
It's seventy-five cents for adults and thirty cents for children under twelve.
大人75美分，12岁以下的小孩30分。
Straight trees have crooked roots.
直树也有曲根。
Good morning, Mr. Zhang. I'm sorry to trouble you.
早上好，张先生。很抱歉打扰您。