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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。

In fact, bridegrooms usually cattty thir carry their white gloves without putting them on, which makes the gloves even more symbolc symbolic , and even less practical!

其他，在日本戴白色手套的别的人是公共运输人那样和那些他们的手有关做用手做着重要的工作的人，比如司机；和还有新郎、在百货商店、车站等需要穿正式服装出现的人。

On top of this, there are non-monetary inducements, such as the hybrid driver's right to use high-occupancy vehicle lanes on dual carriageways, even when he is alone (and even though this adds to petrol consumption per passenger mile).

另外，政府将还给予非货币鼓励。比如，驾驭混动车可以有权使用&多人乘坐汽车专用车道&—甚至是在单独驾驶而非多人乘坐的时候（单乘的情况下每人每公里油耗参数比多人乘坐大）。

Computers have so far been based on two-dimensional chips made from silicon, but there are developments already well advanced to make three-dimensional chips with vastly improved performances, and even to construct them out of biological molecules that can be miniaturised even more than metal-based computer chips.

目前，二维芯片主要用硅制造，现在已经开发了更先进，能量更大的三维芯片，甚至能够用生物分子制造比金属芯片体积更小芯片。

Even though the markets forecast inflation rates well below Fed targets, and even though the monetarists have never, ever, developed a theory explaining why injections of interest-bearing reserves causes inflation?

尽管市场预测的通货膨胀率远低于美联储的目标，即使如此，货币主义者从没有对为什么利息储备注入造成通货膨胀做出一个理论解释？

And even Iran, Even Srilanka is on the list of such countries.

伊朗，斯里兰卡也在这样的国家名单之上。

Even the best physicians have patients die. And even witchdoctors can have patients recover.

再高明的医生也有无力回天之时；相反，纵使是巫医也有&显灵&之日。

The episode that provides the book's title has its comic aspects even though it took place in Riyadh a couple of months after September 11th 2001 and even though the interviewee, a young missionary for the Wahhabi faith, sporting "an unhappy" beard, remarks at an early point,"Shouldn't I kill you?"

成就书名的这段经历有它喜剧的一面，尽管这段利雅得的经历发生于2001年911事件之后的几个月，尽管受访者是一个瓦哈比教派的传教士，玩弄着一副&不高兴的&大胡子，之前还曾扬言道&我不该杀了你吗？&

IF IT PROVES IMPOSSIBLE TO FIND AN AMICABLE SOLUTION, ANY DIFFERENCE OR DISPUTE THAT MAYARISE CONCERNING THE INTERPRETATION, APPLICATION OR CANCELLATION OF THIS AGREEMENT ANDTHE RESULTING OBLIGATIONS WILL BE BROUGHT BEFORE THE ROUBAIX COMMERCIAL COURT,RULING IN ACCORDANCE WITH FRENCH LAW, EVEN IF THERE ARE SEVERAL DEFENDANTS AND EVEN IFTHIRD PARTIES ARE INTRODUCED.

如果这证明不可能找到一个圆满的解决方案，任何差异或争端都可能引起关于本协议的解释，应用或取消，尽管有几个被告，第三方被提案，但按照法国法律，在鲁贝商业法院裁定的判决前，将会生成义务。

Here I can even say that for many of the capitalist countries, is a civil war can not stop the elimination of the disease, and even, a veteran of the United Kingdom, old enough now?

我这里甚至可以说，对于许多的资本主义国家，内战都是一种无法消除的锢疾，甚至，老牌的英国，够老牌了吧？

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。