hardness

坚硬的性质；硬度。

The quality of being hard.

刚性和抗压的特性；不易划伤；用莫氏硬度计量

the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale

这种性质的一个实例；艰难,困苦。

An instance of this quality; hardship.

含有溶解矿物盐的水质,阻止肥皂起泡的特性

a quality of water that contains dissolved mineral salts that prevent soap from lathering

溶解在水中的碳酸钙的量,通常以百万分率(ppm)表示。

The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).

无情或冷酷

devoid of passion or feeling; hardheartedness

金属或其他固体材料对刮擦、切割、压痕或磨损的抵抗能力。

The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.

电磁辐射(如X射线)的穿透能力；通常波长越短,辐射越硬,穿透力越强。

The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.

设施、设备、装置或电信基础设施在遭受攻击时抵抗损坏的度量。

The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.

衡量材料硬度的一种度量。

A measure of how hard a material is.