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In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

As for your dimwit boss and others who seem to try to annoy you, know that they are probably experiencing just as much inner turmoil as they are creating around them, says Jay Winner, M.D., a family physician, stress-management teacher in Santa Barbara, California, and author of Stress Management Made Simple: Effective Ways to Beat Stress for Better Health.

关于自己的笨头笨脑的老板和那些令你讨厌的人方面，你要知道大概他们正是体验的内心混乱和周围他们造成的一样多。

When the snow lay deepest no wanderer ventured near my house for a week or fortnight at a time, but there I lived as snug as a meadow mouse, or as cattle and poultry which are said to have survived for a long time buried in drifts, even without food; or like that early settler's family in the town of Sutton, in this State, whose cottage was completely covered by the great snow of 1717 when he was absent, and an Indian found it only by the hole which the chimney's breath made in the drift, and so relieved the family.

当积雪最深的时候，往往一连一星期，甚至半个月都没有一个人走近我的屋子，可是我生活得很舒服，像草原上的一只老鼠或者牛，或者鸡，据说它们即使长时期地埋葬在积雪中，没有食物吃，也能活下去哩；或者，我像本州的萨顿城中，那最早的一家移民，据说在一七一七年的大雪中，他自己不在家，可是大雪全部盖没了他的草屋，后来幸亏一个印第安人，认出了烟囱中喷出的热气在积雪中化出的一个窟窿，才把他的一家人救了出来。

The taste for them is as enigmatical and yet as common as the taste for dogmatic theology and the poetry of Edgar A Guest.

人们对这类丑陋图案的欣赏，就同某些人对教条主义神学和埃德加·A格斯特的诗歌的迷恋一样，既不可思议，又让人习以为常。

Nevertheless, the skeptic could insist, that, for the externalist, self-knowledge does notcome for free as within the Cartesian framework. The problem of skepticism seems to recurrjust one level up. Yet, we can answer this problem straightforwardly. As soon as the skepticaccepts the justification of externalism on the basis of modal intuitions, he can no longer

但是，这个反对意见基于预设"内容实在论需要自我知识的感知理论（即一个大多数外在论者都放弃的主张'外在论和以 privileged and non-empirical的方式到达mental content是相容的'）"，而且，怀疑论者会坚持'对外在论者来说自我知识并不如笛卡儿式框架那样是自带的'。

At the same time, owing to the computer technology which was considered as the fangle for the learner as well as the software and hardware cost when using the computer, it is still lack of evidence for the extent to which the computer performace appraisal was accepted.

目前最主要的传统绩效考评方法主要分为比较法、行为法、特性法以及目标法等几大类，我们对其中比较法、行为法、特性法中的一些常用的绩效考评方法进行了进行了归纳，并对各种方法的优缺点进行了分析。

Secondly, the nature, as the metaphor of mother, enjoys a gentle body. Maybe because of this, Liu Ming's utilization of pen and ink is of very essential characteristics, namely a reduction in the use of various vigor of painting, for example the use of wrinkled method, while an addition of research and exploration on ink besides the traditional literator painting, for example, the large amount of use of no-born, as well as the correct control of handwriting, enabling his pen and ink to wonderfully match with the feminity of matrix.

其次，自然作为母体的隐喻，其身体是温柔的，也许是由于这一原因，刘鸣在笔墨的运用上也具有非常重要的特点，即在笔墨上减少了各种笔法，如各种皴法的使用，而在传统文人画之外，加大了对墨的试验和探索，如没骨的大量运用，以及笔势的准确把握，使他的笔墨与母体的温柔极其相匹配。

We mainly seek for chrome ore、 ferrochrome、manganese ore、ferromanganese and iron ore, while also looking for chemical、 fine chemical industrycrude oil、 pesticides、stainless steel、the hard tungsten gold、soft tungsten gold、tungsten cobalt gold as well as other products exporters as a long-term cooperative partnership.

公司主要寻找铬矿、铬铁、锰矿、锰铁、铁矿，同时还继续寻找各类化学，精细化工、石脑油、农药、不锈钢、硬钨金、软钨金、钨钴合金。等其他产品的出口商。

Recently chitin and chitosan have become of great interest not only as biopolymers, but also as a new functional materials of high potential in various fields ranging from a simple floccule for waste water treatment to medical materials such as for wound healing and prevention of infection.

甲壳素是一种天然多糖，脱除乙酰基的产物是壳聚糖，作为新型功能生物材料，它们已在水处理、日用化学品、生物工程和医药等领域得到了应用，但它们不溶于一般的有机溶剂，从而限制了其广泛应用。

It covers 15,000 sq km. The population is 5.6 million. The annual average temperature is 17.1°C. The annual amount rainfall is 1300mm. In 2005, Yueyang entered the list of Top 100 cities of China, and was listed in Forb e s Magazine as one of the 20 cities most suitable for opening factories, as well as one of the most suitable places for living.

岳阳地处长江中游南岸，多为平原和丘陵，地势东高西低，属亚热带季风性湿润气候，年平均气温为17度左右，年平均降雨量为1300mm 左右。2005年，岳阳进入中国100强城市之列，被美国《财富》杂志列为中国最适宜开设工厂的20个城市之一，在全国列为良好的人居环境城市第六位

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷