stiffness和hardness有什么分别吗

stiffness: [ 'stifnis ]

n. 僵硬

例句与用法:
1. As I got about, the stiffness in my left leg gradually worked off.
我走动走动，左腿渐渐地不再僵直了。

英英解释:
名词stiffness:

1. the physical property of being inflexible and hard to bend

2. the property of moving with pain or difficulty

3. firm resoluteness in purpose or opinion or action

4. the inelegance of someone stiff and unrelaxed (as by embarrassment)
同义词：awkwardness, clumsiness, gracelessness

5. excessive sternness
同义词：severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness

hardness: [ 'hɑ:dnis ]

n. 坚硬,困难,严厉

例句与用法:
1. Their hardness was understood by the teacher.
他们的艰难得到老师的理解。

2. I can't open the door with hardness of stone.
我不能打开那扇石门。

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