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Gases and liquids are perfectly elastic, after their being compressed they return to their original volume as soon as the applied force is removed.

气体和液体是很有弹性的。在它们受压缩以后，当施加的力一移走，它们就马上恢复原来的体积。

A perfectly elastic demand curve, horizontal to X axis, is infinitely elastic.

理想的弹性曲线平行与X轴，表明具有无限弹性。

It can be described as the case in which the supply curves of all factors, including those of which the maximum amount available to the firm is fixed, are perfectly elastic to the industry, or in which there are no "specialized factors."

这种情况也可说成：所有要素——包括那些对厂商而言最大可用量固定的要素——的供给曲线，对行业而言都是完全弹性的，或者干脆说，其中没有"特殊要素"。

If the firm's demand curve becomes perfectly elastic the inverse of the PED will be zero meaning that the firm has zero market power.

如果一个公司的需求曲线很有弹性，则PED的反作用力为零，这就意味着这个公司毫无市场力。

Based on the fundamental solution of two perfectly bonded elastic halfspaces, the boundary integral equation method is used to reduce the problem to a hypersingular integral equation in which the unknown function is the crack opening displacem...

首先根据双材料空间的弹性力学基本解，使用边界积分方程方法，在有限部积分的意义下导出了以裂纹面位移间断为未知函数的超奇异积分方程，并为其建立了数值法。

Air is perfectly elastic .

镭和铀是放射性很强。

The elasticity point-force solutions for perfectly bonded elastic halfspaces in literatures are further studied. The compact formulae of displacements and stresses are given, which can be used as Green function in the boundary element method.

对已有的关于双相材料组成空间的弹性力学基本解作了进一步整理，给出了问题的位移场和应力场的显式表达式，此解答可作为Green函数在边界元法中进行使用，从而为使用边界元法研究双相材料中的力学问题奠定了基础。

By analyzing the displacement mode of unstable soil and the deformation mechanism of passive pile,an elastic perfectly plastic model and a hyperbolic curve model about the behavior of piled bridge abutment against soil lateral movements are developed on the basis of the previous research.

通过总结侧向变形土体常见的位移模式，分析桥台桩的变形机制，在阐述不同模式下桩侧压力的产生机理及桩的几种破坏模式的基础上，提出桩土间相互作用力与桩土间相对位移的双曲线关系模型和理想弹塑性关系模型，可为相关研究提供参考。

The higher-order asymptotic solutions of a quasi-static, steadily propagating Mode I plane strain crack in an elastic perfectly plastic material are studied.

本文研究了理想弹塑性材料中Ⅰ型平面应变准静态定常扩展裂纹尖端场的高阶渐近解。

Xi ′ an Jiaotong University, Xi ′ an 710049, ChinaAbstract : Propagation of generalized Rayleigh wave in a layered piezoelectric structure with initial stress is investigated. It involves a thin elastic layer bonded perfectly to a piezoelectric elastic substrate.

摘 要：通过求解考虑初应力时的耦合波动方程，研究了覆盖层为各向同性材料、基底为横观各向同性压电材料的压电层状结构中广义Rayleigh波传播时初应力和相速度的关系。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。