hardness

['hɑ:dnis]

n.坚硬, 困难, 严厉

例句与用法：

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

Despite the hardness of his bed, he is soon sleeping soundly.

虽然床很硬，他还是很快地睡熟了。

I can't open the door with hardness of stone.

我不能打开那扇石门。

Their hardness was understood by the teacher.

他们的艰难得到老师的理解。

详细释义：

n.[U]

1. 坚硬

2. 【物】硬性; 硬度

3. 困难

4. 冷酷, 严厉