纤维可占材料体积的三分之一以极大改善材料的强度和硬度。
The fibers can occupy up to one third of the material volume to considerably improve the material strength and stiffness.
它具有相同的华晨和硬度的钻石在一小部分的成本。
It has the same brilliance and hardness of a diamond at a fraction of the cost.
并用有限差分方法计算了这103种元素的电负性和硬度。计算中考虑了相对论效应。
The finite- difference method is used in calculations on electronegativity and hardness of 103 elements.
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