介质

We extend the second order elastic tensor of Husdon's and turn it to a matrix which makes the calculation of second order perturbation much more concise. Then the azimuthally phase and group velocity formulas of plane wave propagation in horizontal plane are deduced according to Christoffel equation, and the azimuthally dependent velocities in dry and water saturated cracked medium are calculated.

而后，根据Christoffel方程推导了由各向同性背景介质中含两组非正交的垂直裂隙而形成的等效单斜各向异性介质中，在水平面内随方位变化的相速度和群速度的计算公式，并对干裂隙和饱和流体填充裂隙介质两种具体情况进行了计算。

As for the radius of porous media effect our experiments select four kinds of sea-sand whose pore radius vary between 125-700μm.The results shows that the pore radius we use in the experiments are too large to produce capillary effect which can clag the process of hydrate formation, only if the pore radius is smaller than 60 nm the can produce capillary effect.

基于粒径范围125-700μm的四种多孔介质的甲烷水合物生成实验结果表明，较粗粒径的多孔介质引起的孔隙间毛细作用对甲烷水合物不会产生明显的阻碍作用，但计算结果表明，孔径粒径小于60nm的多孔介质会阻碍甲烷水合物的生成。

And the rock mass as the main object of most engineering practice is developed by all kinds of geotechnical action and force in the long geology history to the complex characteristic of continuous medium, crannied medium and granular medium, to the anisotropic and heterogeneous entity with elasticity, plasticity, viscidity, creepocity and rheology.

作为主要工程对象的岩体是在漫长的地质历史发展过程中经受各种地质营力作用而形成的成因和构造复杂，岩性多样且包含了连续介质，裂隙介质和散体介质特征的，兼有弹性、塑性、粘性、流变性的各向异性的非均质地质体。

In the course of the impulse through underground mediator, because the physical property and the geometric property of mediator is non-uniform, wave form and wave amplitude will change very much and the impulse after shock、antenna direction figure、the couple degree of ground surface、system interfere、non-uniform of the underground mediator、reflection surface's rough cause the disturb of radiation scatter and diffract will complex the figure .

脉冲在通过地下介质的过程中，由于介质的物性和几何性质的不均一性，波形和波幅将发生较大的变化，而脉冲余振、天线方向图形、天线的地表偶合程度、系统内部的干扰、地下介质的不均匀、反射面不光滑等引起的辐射效率、散射的变化以及剖面旁侧的绕射等干扰，均使实时记录图像复杂化。

We investigated the receiver functions in a horizontally-layered medium with arbitrary oriented hexagonally symmetric anisotropy, and discussed the phenomenon of shear-wave splitting and energy deviation in an anisotropic medium. The anisotropic structure yields patterns of receiver function amplitudes and arrival times on both the radial and transverse components that are a systematic function of source-receiver back azimuth. We also investigated the influence of varying anisotropy parameters, e.g.

采用具有任意方向对称轴的横向各向同性介质系统，探讨了各向异性介质中接收函数表现出的横波分裂、能量偏离等特征，并系统剖析了各向异性介质对称轴方位角、倾角以及各向异性层位分布对接收函数方位变化花样的影响。

In order to keep consistent with GB 50235-97 "Construction and Acceptance Specification for Industrial Metal Piping Works" and SH 3059-2001 "General Regulation on Material Selection for Petrochemical Piping Design", this revision has only defined the extreme harmful medium as virulent medium, and, piping with the transmission hypertoxic levels of moderate harmful and gentle harmful medium is added in the application scope.

本次修订为保持与 GB 50235-97《工业金属管道工程施工及验收规范》和 SH3059-2001《石油化工管道设计器材选用通则》协调，仅将毒性程度为极度危害介质定义为剧毒介质，同时在适用范围中增加了输送毒性程度为中度危害和轻度危害介质的管道，并增补了有关施工及验收规定。

In the end ,it comes to the conclusion that the phase behavior of gas condensate considering effect of reservoir deformation,capillary force,capillary condensation and interfacial adsorption is not only notably different from phase behavior in PVT cell but also remarkably different from phase behavior in indeformable and porous media. therefore,it is

最后得出结论，储层变形、界面吸附、毛细凝聚、毛细管力对凝析气藏油气体系相态特征有重要的影响，其相态特征显著不同于常规不考虑介质影响时的情形，也显著不同于前人研究的无变形多孔介质中的相态特征；因而建议在工程应用中，考虑介质变形和界面现象对凝析油气体系相态特征的影响。

There was the jellylike medium in which the transverse wave spread. A deformation of the jelly, caused by the rotation of the sphere, moved through the medium.

又有一种胶状的介质，横波就是在这种介质中传播的，由于圆球的转动而引起球面上的胶状物的形变，这种形变在介质中向外传播。

The efforts that have been made to explain optical phenomena by means of the hypothesis of a medium having the same physical character as an elastic solid body led,in the first instance,to the understanding of a concrete example of a medium which can transmit transverse vibration but later to the definite conclusion that there is no luminiferous medium having the physical character assumed in the hypothesis.

为了解释光学现象，人们曾试图假定有一种具有与弹性固体相同的物理性的介质。这种尝试的结果，最初曾使人们了解到一种能传抽横向展动的介质的具体实例，但后来却使人得出了这样一个明确的结论：并不存在任何具有上述假定所认为的那种物理性质的发光介质。

The efforts that have been made to explain optical phenomena by means of the hypothesis of a medium having the same physical character as an elastic solid body led, in the first instance, to the understanding of a concrete具体的 example of a medium which can transmit transverse横向的 vibrations, and at a later stage to the definite conclusion that there is no luminiferous medium having the physical character assumed in the hypothesis.

为了解释光学现象，人们曾试图假定有一种具有与弹性固体相同的物理性质的介质。这种尝试的结果，最初曾使人们了解到一种能传输横向振动的介质，后来又使人们得到一个肯定的结论即具有上述假定所认为的那种物理性质的发光介质是没有的。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。