1. 名詞
   不可數名詞: 硬度, 堅硬
   硬性
   困難
   

   同義字詞
   adversity,asperity,difficulty,hardship,rigor
   exactingness,harshness,inflexibility,rigidity,rigidness,rigor,rigorousness,severity,sternness,strictness,stringency
   

例句

1. Q: What is the hardness of my water?
2. A brief hardness flared in his eyes.
3. Only hardness is listed for through hardening.
4. Sometimes both toughness and hardness are desired.
5. O hardness of our carnal heart, more than adamantine!
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