n.硬（刚，强）度；（坚）硬性；坚固（牢）；硬度数；刚度指数；核防护能力，困难；难解；苛刻；无情

The diamond's hardness is unparalleled in the mineral world.
翻译：钻石的硬度在矿物世界中无与伦比。
The hardness of water can affect the performance of a coffee maker.
翻译：硬水的硬度可能会影响咖啡机的性能。
The gemstone was tested for its Mohs hardness scale rating.
翻译：这块宝石被测试了它的莫氏硬度等级。
He wore gloves to protect his hands from the tree's rough bark, which had a high hardness.
翻译：他戴着手套以防手被树皮的粗糙质感（硬度高）伤害。
The hardness of ice makes it difficult to drill holes in it.
翻译：冰的硬度使其难以钻孔。
The hardness of steel is essential for its durability in construction applications.
翻译：钢材的硬度对于其在建筑应用中的耐久性至关重要。
The hardness test showed that the metal was a Grade 9.
翻译：硬度测试显示这种金属是9级。
The hardness of a material determines its resistance to scratching.
翻译：材料的硬度决定了其抗刮擦能力。
A high hardness value indicates a harder material, like tungsten carbide.
翻译：高硬度值意味着更硬的材料，如碳化钨。
The hardness of a pencil is measured on a scale from 9H to 9B.
翻译：铅笔的硬度以从9H到9B的刻度进行衡量。