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Aldol condensation 2, 5-dimethoxymethoxyacetophone with 2, 4, 6 -tri methoxymethoxybenzendehyde, then hydrogenation, reductive, the key intermediate 83 (84) of natural product 3, 5, 7, 2′, 5′- pentahydroxyflavan, was obtained; Mini reviewed EGCg activity, Then gallic acid and phloroglucin were used to synthsis EGCg, The key intermediate Chalcone 109 of EGCg was abtained through 7 steps from gallic acid.

重点介绍了以没食子酸为原料，经酯化，保护，还原，氧化，格氏反应，氧化六步反应得到3，4，5-三苄氧基苯乙酮，以间苯三酚为原料，经维斯迈尔反应，苄基保护，甲氧甲氧基保护三步反应得到2，4-二苄氧基-6甲氧甲氧基苯甲醛，酮106与醛108经羟醛缩合得到EGCg重要反应中间体查尔酮109。

First, based on the research of vocality art and vocalization, I discuss how to set up reasonable aesthetics concept on tenor"s voice, then expatiate on the characteristics,of the tenor"s voice in bel canto and the theoretic significance of setting up reasonable sound aesthetics concept. This essay is mainly on the way and key point of constructing tenor" s voice, especially solving the core problem of alt skill. The essay argues that the construction of tenor" s voice is based on the mediant and undertone sections; finding the phonate source, practice step by step, surrounding the point , string and side of the voice; train the students using suitable vowels according to the students with different characteristics ; emphasizing that ten essential words are the golden key to solution of the core problem in the "closing " method.

首先从研究声乐艺术和发声方法的指导思想和出发点着手，探讨了如何建立科学的男高音声音审美观；进而阐述了美声唱法中男高音的声音特点及建立科学审美观的理论指导意义；本文着重提出了构建男高音声音的方法与要领(特别是解决高音技术这一核心问题)，本文认为男高音声音构建先以中、低声区为基础，从找发声点开始，围绕声音的点、线、面逐一训练，同时根据不同特点的学生选择合适的母音进行训练，强调了&关闭&唱法中十字要领是解决核心难点的金钥匙。

To facilitate the study of novel pairwise key predistribution techniques, this paper presents a new framework for establishing pairwise keys between sensors on the basis of an ID-based key predistribution protocol.

在分析了现有密钥预分配协议的前提下，该文提出一种新的基于ID的密钥预分配协议。

The proposed key predistribution scheme has advantages over random key predistribution scheme in its security and only spends moderate computation cost so it is quite practical.

与随机密钥预分配方案相比，本方案在健壮性和安全性方面具有一定的优势，其计算和存储开销也不大，具有一定的实用性。

The analysis results show that this scheme doesn't need additional memory space and increases the probability that neighbor nodes have the same key space. Compared with the pairwise key predistribution scheme, this scheme can increase the threshold of captured nodes and improve the security of WSN, and fits the network environment and meets the security requirements of WSN.

分析表明，该方案在不增加存储空间的情况下，提高了邻居节点拥有相同密钥空间的概率，并且与多密钥空间密钥对预分布方案相比，可大幅提高被俘节点的阈值，增强了网络安全性，能够较好地适应无线传感器网络的网络环境和安全要求。

The proposed hexagon-based key predistribution scheme belongs to static key management schemes.

本文提出了一种静态****管理方案——基于正六边形的****预分配方案。

This scheme selects the minimal span set of all predistributed keys by running the adaptive key selection algorithm. It can maintain the security of the network and improve the connectivity among sensors simultaneously and integrate with the existed key predistribution schemes very easily.

该方案通过运行自适应****选择算法生成部署集中所有预分配****的最小生成集，从而在维持较高安全性的同时极大地提高了传感器节点之间的连通概率，并且能很容易地与现有的****预分配方案相结合。

There are 3 key provincially supported disciplines, 10 key construction disciplines of university, 6 brand-making majors of university, 2 provincially model laboratories, 15 elaborate courses of university and 1 provincially elaborate course.

学校全面加强学科建设，按照强化基础学科，突出优势学科，扶持新兴学科的思路，对原有学科布局进行了优化和重组。

This opportunity the Expo offers to rebrand Liverpool and the region in the eyes of a key Chinese audience is one of the key tangible benefits the business plan spells out.

世博会所提供的让利物浦重新标志该城市和西北部其它地区品牌的机会是中国观众有目共睹的。而这也是此商务计划提到的最直接的重要收益之一。

The scheme adopts a multi-agent system and a threshold secret share technology, in which the secret information and the shares are carried by many different agents, adopts D-H key exchange technology to encrypt intermediate result to hide real intention of agent, to protect the privacy of agents and to enhance the reliability and the fault-tolerance capability of the mobile agent system. A mobile agent with limited authorization can sign a message on behalf of a user at far-end without divulging the user s private key. In order to avoid rebuilder attack the time-stampe mechanism is adopted.

运用信息加密和身份认证技术，实现了移动Agent和Agent平台间双向身份认证，有效地防止了恶意Agent对Agent平台的攻击或越权访问以及恶意Agent平台对Agent的攻击；引入远端可信任的代理平台作为数据处理平台，采用多代理系统和门限秘密共享技术，将加密信息和密钥由多

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。