1.  rigid
2.  hardness
3.  stiff
4.  inflexible

• 1. 硬性: Rigid | hardness | Hard | solidness
• 2. 硬性辐射: Hard radiation
• 3. 硬性角膜接触镜: RGP | hard corneal contact lens | RGPCL | rigid gas permeable contact lens

更多释义

• 1.这事没有什么硬性的规定。
  There are no hard and fast rules about this.
  dict.yoduao.com
• 2.这些课不是硬性规定要听的。
  Attendance at these lectures is not compulsory.
  dict.yoduao.com
• 3.从全球来看，掌握一门以上的语言在许多领域被视为一种优势，甚至是一种硬性的要求。
  Globally, knowing more than one language is viewed as an asset and even a necessity in many areas.
  dict.yoduao.com

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