Khn
[医][=Knoop hardness number]努普（氏）硬度值
🗣️ 情景例句
Have gone to the railroad station.
去火车站。
In secondary school, children study mathmatic、phsicas and chemistry.
中学的小孩会读到数学、物理和化学。
The shape and dimensions of the skyscrapers depend entirely on the necessity of obtaining the maximum income per square foot of ground,
每平方英尺地皮取得最大收入