主要

This thesis first proposes the idea of EM in view of the drawbacks existing in traditional modeling methods. The main approaches and the general procedure of EM are described and the recent work of GP is surveyed using a taxonomy. Secondly, in terms of model types, the EM problem of complex functions, the EM problem of system of ordinary differential equations and the EM problem of higher-order ordinary differential equations are studied in detail. Finally, some advantages and disadvantages of the EM method are summarized at the end of this thesis.

本文首先针对传统建模方法的不足，提出了演化建模的思想，阐述了演化建模采用的主要方法和一般步骤，并分类概括了遗传程序设计目前的研究内容；然后，按照所建模型的类型不同，分三章详细研究了复杂函数的演化建模问题、常微分方程组的演化建模问题以及高阶常微分方程的演化建模问题；最后，本文对演化建模的主要特点和目前存在的主要问题作了概括和总结。

The second part gives the introduction of present agriculture related tax policy, including the main tax category and tax allowance policy. This part analyzes the question in present agriculture related tax policy. It is mainly that tax policy has difference in urban and rural areas, and the tax allowance result is unsatisfactory.

第二部分介绍现行涉农税收政策的主要内容，包括主要的涉农税种及优惠政策；分析现行涉农税收政策存在的问题，主要是税收政策存在城乡差异，税收优惠效果不理想等。

As the country's four major river flood control, one of the Yongding River is the city's main flood discharges from the river, the main flows through the Shijingshan District, Fengtai District, and Mentougou.

作为国家的四个主要河流洪水控制，其中永定河是城市的主要排放洪水的河流，主要流经石景山区，丰台区和门头沟区。

The usual infrared thermoelectrical material are enumerated with its essential parameters in the article,and the main progress home and abroad is explained by comparison.

文章列出主要常规红外热释电材料及其主要参数，在对它们进行比较的同时，着重阐述国内外近年来红外热释电材料在红外热释电探测器方面应用研究的主要进

Precipitations that carry different polarities and quantities charge always coexist in thundercloud, and surface electric field is influenced by primary precipitation.

分析结果表明，固态降水主要携带正电荷，液态降水主要携带负电荷，各类带不同极性和数量电荷的降水粒子常共存在雷暴云中，Egnd主要受携带电荷量占主导地位的降水粒子的影响，地面出现强正电场时正好是云在当顶并且地面出现强固态降水的时间。

By tracing the antifungal and antibacterial activities of the volatile oils, it is found that the major active site in fiuit oil of Litsea mollis is aldehydic fraction such as citral, the major active site in oil of Thymus quinquecostatus is phenolic fraction such as thymol and the major active site in ginger oil is high boiling-point terpenic constituents such as β-caryophyllene, eudesm-4 (14)-en-11-ol, et al.

通过抗菌活生追踪发现，毛叶木姜子果油的主要活性部位是醛类成分，如柠檬醛；地椒油的主要活性部位为酚类成分，如百里香酚；姜油的主要活性部位为"高沸点萜类组分"，如β-丁香烯、4（14）-桉叶油烯醇-11等。

Sandouping and Huanglingmiao suites consist mainly of tonalite, trondjemite and granodolerite, being syntectonic granitoids emplaced at the ductile domain 16 km deep under the action of SN-strikingregional compression.

三斗坪和黄陵庙两个岩套主要由英云闪长岩、奥长花岗岩花岗闪地组成，是在近南北向区域挤压下于约16km深部塑性域定位的同构造花岗岩，前者主要依靠岩浆在构造弱面逐次强力楔入创造定位空间，后者主要在处于活动状态的韧性拉张剪切带内定位。

The results indicate that the main phase of the nephrite cat's eye is tremolite,and the main impurity ions are Fe~(3+), Fe~(2+) and Mn~(2+).

软玉猫眼的主要杂质离子为Fe~(3+)，Fe~(2+)和Mn~(2+)，其Raman吸收频率主要出现在940～1105，650～760cm~(-1)和450～510cm~(-1)范围内。3600～3800cm~(-1)范围内—OH伸缩振动Raman谱带分裂，并向低波数方向位移，这主要与Mg~(2+)和Fe~(2+)的含量有关。

According to the international standard ISO7027,we can know that the measurement of turbidity mainly use the optical turbidimeter measurement,it contains the scattering-light method and transmitted-light method. The scattering-light method has application in measurement for low turbidity water and also can used in high turbidity water.On the other hand,the transmitted-light method is more suitable for high turbidity measurement.

根据国际标准ISO7027可知，现今测量水的浊度主要以光学浊度仪测量法为主，主要包括散射光法和透射光法两种，散射光法主要用于测量低浊度水，但也可用于高浊度水的测量；而透射光法更适合于测量高浊度水。

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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。