Khn
[医][=Knoop hardness number]努普（氏）硬度值
🗣️ 情景例句
about your math teacher or your math homework.
你的数学老师或你的数学作业。
You're likely to see a cheerful message or two hanging on the wall.
很有可能会看到一两条挂在墙上的格言。
Yes, we have been interested in new system.
是的，我们对新系统很感兴趣。