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Classified by commodity variety, it can be categorized into the counterfeiting of consuming goods, agricultural goods, architectural materials, medical goods, industrial means of production, publication, paper currency and cultural relics; classified by nature, it can be categorized into fake commodities and substandard commodities; classified by information structure, it can be categorized into the counterfeiting of symmetric information and dissymmetric information.

按照商品品种分类，可以分为消费品类假冒伪劣、农资类假冒伪劣、建筑类假冒伪劣、药品类假冒伪劣、工业生产资料类假冒伪劣、出版类假冒伪劣和纸币文物类假冒伪劣；按照性质分类，可以分为假冒商品、伪劣商品；按照信息结构分类，可以分为不对称信息的假冒伪劣、对称信息的假冒伪劣。

In this paper, the author first introduces some basic conception of Cipher technology and Shannon model of secret communication, then the paper discusses and analyses the advantages and problems of symmetric algorithm and dissymmetrical encryption.

在介绍密码学基本概念以及Shannon保密通信模型的基础上，分析了对称密码算法和公钥密码算法的优点及其在应用中注意的问题，最后对密码算法的发展及其应用的未来做出展望。

This system can be used to study the plasma accumulation and heating, potential shielding and electrostatical end plug of axial symmetric tandem mirrors.

该装置可用作为等离子体积累与加热、电势屏蔽、静电堵漏轴对称串级镜端塞的研究。

With the occurrence of the gliding, one side of the gliding face is enantiomorphously symmetric with the other side.

当滑移作用产生之后，滑移面的一侧与另一侧成镜像对称关系时，称双晶滑动。

Elegans ortholog of the transcription factor Engrailed, controls symmetric and asymmetric division of stem cell-like seam cells.

在ceh-16功能缺失的突变体中，原本应该进行对称分裂的侧线细胞会异常而进行不对称分裂，而且如果在ceh-16突变体中导入人的同源基因 En2能够回复这种异常表型，说明ceh-16的这种调节功能在进化过程中是十分保守的。

Flowers radially symmetric, bisexual or unisexual, hypogynous, perigynous, or epigynous; perianth cyclic, rarely spiral, in unisexual flowers remnants of opposite sex present or absent.

开花辐射对称，单性的两性或，，周位，上位的或；花被轮列，很少螺旋形，在单性花内有或无异性花的残余存。

Symmetric instability is important to the development of extratropical oceanic frontal cyclones and Jiang-Huai rainstorm, which, as a kind of mesoscale unstable energy, must be started up to come into effect.

4对称不稳定作为一种中尺度的不稳定，对本研究中海洋气旋及江淮梅雨锋中尺度系统的发生发展有重要作用。

It consists of symmetric spherical roller,two pcs of prssed steel cages,flangeless inner ring and guide ring centred on the cage.In general,this kind of bearing has more roller quantities and higher dynamic load rating.

国际最新设计，对称滚子和两片钢冲压保持架组成内圈无挡边，没有中挡圈，调心滚子一般会增加2到4个，提高轴承的径向额定动载荷。

We detailedly analyse the low-frequency radiative energies of the elastic waves which are generated by different axially symmetric sources in fluid — filled boreholes, and formulize the energies of tube,compressional and shear waves.

本文详细研究了充流体井中由不同类型轴对称震源激发的弹性波的低频辐射能量，导出了管波、纵波和横波能量的解析解表达式。

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。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。