N. p. n.
[医] 非蛋白氮
🧩 词语组成解析
abbr. 名词
abbr. 名词
🗣️ 情景例句
I'm pleased to meet you, Mr. Peter.
皮特先生，很荣幸认识你。
How long will the flight be delayed?
班机诞误多长时间？
Before they were replaced by steamships,
在蒸汽船取代帆船之前。