hardness

英['hɑ:dnis]美['hɑ:dnis]

n.[U]
坚硬，困难，严厉，勇气

同：	[n.] callosity, harshness, insensibility, ruggedness
反：	[n.] softness

Once a satisfactory system of lubrication has been secured the hardness of the interacting elements becomes critical.
一旦获得了满意的润滑系统，相互作用的元件的硬度就成为紧要之事。收藏
These trees are noted for their straightness and hardness.
这些树的特点是树干挺直，木质坚硬。收藏
He is a man of brick: as if he had been born as a baby literally of clay and decades of exposure have baked him to the color and hardness of brick.
他是条硬汉子:好像生来就是泥质的，几十年的风风雨雨把他烧得像砖一样又黑又硬。收藏
They can bear in mind the hardness their ancestors experienced and carry forward the spirit of unity and struggle.
好让人们进入场地和欢快起舞时，不忘先祖创业之艰辛，发扬团结奋斗的民族精神。收藏
A stone once believed to be impenetrable in its hardness.
硬石，金刚石一种曾被认为在硬度上不可穿透的石头收藏

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