Pnu
[医][=protein nitrogen unit]蛋白氮单位
🗣️ 情景例句
How long does it take you to get through a letter?
你写一封信要花多少时间？
Fire that's closest kept burns most of all.
关得最紧的火，燃烧得最炽烈。
Most of the earth's surface is covered by water.
大部分的地球表面被水覆盖着。