Khn
[医][=Knoop hardness number]努普（氏）硬度值
🗣️ 情景例句
I had a nice evening.
让我过了一个愉快的夜晚。
A great ship asks deep waters.
大船要走深水，蛟龙要在海中游。
How should I tell him the bad news?
我该如何告诉他这个坏消息？