关键途径

1 Catalyzes a reversible oxidative deamination of L-Alanine to pyruvate and ammonia, with NAD〓 as cofactor.

它是生物体内的氨基酸代谢和氨同化途径的关键酶。

Combustion chamber is one of the key components in gas turbine.

燃烧室是燃气轮机的关键部件之一，其几何结构和内部流动非常复杂，设计难度较高，数值模拟的方法是研究其流动规律的一种有效途径。

The biotransformation of cornstalk is an important way of exploiting and utilizing cornstalk resource. The efficient degradation of cellulose and hemicellulose is pivotal tache of the translation.

秸秆的生物转化是秸秆资源开发利用的重要途径，秸秆纤维素和半纤维素的高效降解是实施该转化的关键。

The study shows that the share corporative system is the way to effective transtition of the medium-and-small-sized state-owned enterprises.

国企转轨所涉及的产权交易和存量资产流动、重组的成效是成功转轨，建立现代企业制度的关键，而进行股份合作改制则是国有中小企业改制的有效途径。

Through elucidating the way that Confucianism affects the Chinese clasical gardening, the paper stresses that only by carrying out the Confucian values of sincerity and correctitude in Chinese classical gardening design and construction, reliving the civilizing function of igniting intelligence, correcting some philosophy, and reflecting on the significance of the life, all of which belong to Confucianism in Chinese classical gardening, can the Chinese classical gardening get rid of the fate that being submerged by western culture and relive the power of sustainable development.

文章指出儒家思想影响中国园林的新的途径与新的方式，强调只有将儒家思想中诚敬端正的价值观念贯彻于园林的营造之中，通过在园林中重新发挥传统园林启发智慧、端正心灵等诸多功能，才是中国园林得以发展，充满希望和生命力的关键所在。

MPLS is the crasis point of the information transmission switching technology of broadband networks in the future and is prospective to become the most competitive IP backbone network technology of next generation.

本文探讨人们一直关注的问题：如何构建高效、高质量地传输包括数据、多媒体及实时业务在内的综合业务宽带通信网络，并研究作为解决问题有效途径之一的多协议标记交换中的关键技术问题。

It is a fundamental way to seekcontrol method based on the determinant factor of pathogenesis.

根据它致病的关键因子去寻求控制策略是最根本的途径。

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。

Plenty of samples is provided for training BP neural network by traditional design method and the topology structure is built using forward propagating data and backward propagating error data, which is applied to optimal design of parallel double broken line pulley in order to accomplish the mapping between main parameter of hoisting mechanism of gantry crane and the related parameters of parallel double broken line pulley.

利用传统的设计方法为BP神经网络的学习提供足够样本集，然后通过正向传播和误差反向传播建立BP神经网络的拓扑结构，并将其应用于平行双折线卷筒的智能设计中，以完成龙门起重机起升机构主要设计参数与平行双折线卷筒相关参数的映射，提高设计的质量和效率，为龙门起重机关键零部件的智能设计提供一个新的途径。

Under an open international market, the sustained and rapid development of Chinese agriculture depends on the development and expansion of a number of dragonhead enterprises of industrialized agriculture , which is not only an important approach to promote rural productivity development, to realize modernized agriculture, to prosper rural economy, but also is an important directive and overall mission for agricultural and countryside work in the new century.

在大开放的国际市场环境下，我国农业要实现持续、快速发展，关键在于发展和壮大一批农业产业化龙头企业，这不仅是促进农村生产力发展，实现现代农业、繁荣农村经济的重要途径，也是新世纪新阶段农业和农村工作中带有方向性、全局性的大事。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。