Pnu
[医][=protein nitrogen unit]蛋白氮单位
🗣️ 情景例句
Mr. Park is a devoted husband.
帕克先生是个忠实情深的丈夫。
Why?
为什么？
They sting or bite without provocation; they fly uninvited into our rooms on summer nights, or beat ageist our lighted windows.
它们无缘无故地又叮又咬；夏天的晚上，它们未经邀请便飞到我们房间里，或者对着露出亮光的窗户乱扑乱撞。