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Under the guidance of the Marxist dialectical materialism and the historical materialism, the author of this dissertation makes a relatively systematic study of the noumenal problem of teaching-learning, making use of the achievements in other subjects and the relevant studies of this problem in didactics, following the principle that the object should be done from the phenomenon to the essence.

本文以马克思主义辩证唯物论和历史唯物论为根本指导思想，借鉴有关学科的研究成果和教学论学科对此问题的相关研究，遵循研究对象从简单到复杂、从具体到抽象、从低级到高级、从现象到本质的认识路线，对教学本体问题进行了比较系统的研究。

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。

However, the extent of its products make digital, resolution is not high, relatively low power densities, poor reliability shortcomings.

但其产品存在数控程度达不到要求、分辨率不高、功率密度比较低、可靠性较差的缺点。

Different types of microbialites were formed in different water depths, containing different assemblages of cyanobacteria and benthic animal fauna. Our research indicates that the digitate or domed microbialites should have been deposited in the most shallow water environment and the laminated or clotted microbialite probably in relatively deep water conditions.

不同微相类型的微生物岩在沉积水深、蓝细菌化石、底栖群落组合上仍存在差异，其中树枝状和弯窿状微生物岩沉积时所处水深最小，花斑状微生物岩和层纹状微生物岩沉积时所处水深可能相对较大。

A relatively small crowd of hipsters chatter quietly in the dimly-lit room, enjoying the cell-phone-banned space.

也只有那一小群市面灵通的人才有机会在昏暗的灯光下轻声闲聊，享受那个没有手机打扰的世界。

The migration of dinoflagellate cysts with transapical archaeopyle su-ture from sea water to fresh water lasted relatively long.

具过顶古口缝的沟鞭藻囊孢由海水向淡水迁移持续的时间较长。

Because Dione is relatively small, an impact causing a 35 kilometer crater could have spun the satellite.

由于土卫四比较小，在受到比较大的撞击（撞击坑大于35千米）时它会被转动。

One major reason Russian Diopside is relatively unknown is that it has only recently become available in sizable commercial quantities.

俄透辉石鲜为人知最主要的原因是因为她是最近几年才有规模商业供应的宝石。

A relatively simple method was presented to generate a dislocation dipole.

首先提出了相对简单的建立位错偶极子的新方法。

It is important to understand the longevity requirement of the printed image as direct thermal labels are designed for relatively short-term applications.

重要的是要了解热标签寿命要求，直接打印的应用而设计的形象是相对短期的。

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。