人类智能可以学习，扩展和变化，但很多专家系统是刚性的，并且缺乏学习能力。
The human mind can learn, expand, and change, but many of the Expert systems are too rigid and don't learn.
石油和小麦的价格会随着供求关系的变化而变化，但是工资是“刚性的”：即使当经济形势不好的时候，想要让降薪也是很困难的。
Oil and wheat prices may rise and fall instantaneously to reflect supply and demand, but wages are "sticky" : even when the economy goes bad, it takes a lot to make them fall.
并讨论了位错力随材料相关参数，非理想界面参数，裂纹和刚性线弧度的变化规律。
The variation of screw dislocation forces for correlative material parameters and different radians of crack or rigid line is discussed particularly.
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