Soft material changes the shape when being stressed. 软质材料受压会改变形状。
As a special case of the present problem, solutions for an interface rigid line and for collinear periodical rigid lines in a homogeneous material can be obtained. 从解答的特殊情形,可导出一条界面刚性线问题及均质材料中共线周期刚性线问题的解答。