Pnu
[医][=protein nitrogen unit]蛋白氮单位
🗣️ 情景例句
He never drinks except on special occasions.
除非在特别场合，他从不喝酒。
What's the point of feeling blue?
有什么好悲伤的？
Don't tie it to that old branch. I think it'll break. Tie it to the one on the right.
别把它绑在那根老树枝上。我想它会断的。把它绑在右边的树枝上。