red hardness

例句：

1. 1. The red hardness of the paint is uneven, making it difficult to apply evenly.
   油漆的红色硬度不均，使得涂覆时难以均匀。
2. 2. The red hardness of the material makes it suitable for use in areas with high temperatures.
   材料的红色硬度使其适合在高温区域使用。
3. 3.The red hardness of the paint can affect its durability and longevity.
   油漆的红色硬度会影响其耐用性和持久性。