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During these years (1997-2000) in the research area of annonaceous acetogenins 5 natural products and a number of chiral-pure analogs of annonaceous acetogenins have been synthesized using sugars as the starting materials. Their high activity and selectivity against cell line of colon tumor and a relationship between activity and configuration have been found too. In the respect of inhibitor of sialidase two new methodologies for the synthesis of chiral-pure 3-deoxy-ulosonic acid using hetero-Diels-Alder reaction or asymmetric propargylation as the key reaction were developed. On the topic of anti-leukemia marine natural product clavulactone a synthetic method based on the free radical cyclization and starting from sugar has been developed. In other title of PKC inhibited agent sphingosine a new synthetic route with SN2' as the key reaction has also been disclosed.

项目期间（1997-2000）在番荔枝内酯方面从糖出发合成了五个天然产物和一批手性纯的类似物，它们对肠癌细胞有很高的活性和选择性，并与构型有关；在唾液酸酶抑制剂方面发展了二类全新手性纯高碳糖的合成方法－杂原子D－A反应或丙炔基不对称加成为关键的反应；抗白血病海洋天然产物群柱虫内酯方面研究了由糖出发和自由基环化反应的合成方法；对PKC 起抑制作用的鞘氨醇方面也开创了新的合成途径－由糖出发并以SN2'反应为关键反应。

The availability of cheap, plentiful whiskey was one key to the extensive use of spirituous liquor by so many Americans in the early nineteenth century; another key was the American diet.

十九世纪早期，很多美国人大量饮用酒精饮料，一个原因是当时有很多便宜的威士忌；另一个原因是美国人的饮食习惯。

As long as your computer, enter in the system before the Windows startup screen, press the F8 key (or restart the computer holding down the Ctrl key), there will be multi-mode operating system to start menu, just need to select "Safe Mode", will be Start the computer into Safe Mode.

只要在启动计算机时，在系统进入Windows启动画面前，按下F8键(或者在启动计算机时按住Ctrl键)，就会出现操作系统多模式启动菜单，只需要选择"Safe Mode"，就可以将计算机启动到安全模式。

The work reads as follows: setting up the concept of network users" behavior and categorised system, then discussing the classification of users based on network users" behavior; analyzing the information source of network behavior analytical system, considering mostly two respects of efficiency and accuracy of behavior information; probing into the demand,step and system frame for establishing network user"s behavior analytical system, and discussing some key technology in course of the system implementation; Then putting forward several kinds of common application modes or thought of network users" behavior analysis, including network click flow analysis , computer and network security analysis and user structure analysis of Intranet. The key algorithm of behavior analysis system has been discussed and improved .

本论文在此领域主要工作成果如下：建立了网络用户行为的概念与分类体系，并在此基础上进行了用户分类；分析了网络行为分析系统的信息源，其中主要考虑了信息获取的高效性和准确性两个方面；探讨了建立网络用户行为分析系统的需求、步骤和体系框架，以及设计和实现系统过程中所面临的一些关键技术；接着在上述基础上提出几种常用的网络用户行为分析系统模型或其思想，主要列举了网络用户行为分析在Web点击流分析、计算机与网络安全方面以及Intranet网内用户结构分析中的应用。

When one of these keys is defined, Glider will stop running and press the key every so often, according to the key definition.

当其中一个这样的按键被定义后，滑翔机会根据设定的时间到了后不断地尝试发送这个按键的事件。

The key is in a span called post-meta-key so you can style it in your style sheet.

关键词是在一个span中，称为post-meta-key，这样你可以在你的样式表中将它设计。

When playing " crossed harp", use a harmonica tuned to the subdominant of the key of the piece you are playing . In other words, for a tune in the key of G ,use a C harmonica ,etc.

当用"交叉法"演奏，用一支口琴把你所演奏的位置变成主和弦的调，换语话，用C调口琴演奏出G调，以此类推。

Main business products : Plastic's spring rope, mobile rope, mobile chain, mobile's accesories, mobile convenience nip, mobile wipe, key ring, hand ring, EVA sunbonnet , fishing rope, key hang brand which is extensively be used in mobile, stationery, fishing tackle, fitness equipment, hardware tool, dress' accessory, gambling house's chip and all sorts of promotion Gifts, advertisement's gifts.

专业生产：塑料弹簧，塑胶弹簧，玩具弹弓线，塑料钥匙链，钥匙扣，浴室手环，手圈，手机弹簧绳，手机挂链，手机绳，手机吊绳，手机饰品，手机配件，钥匙吊牌，渔具失守绳，文具台笔，健身器材弹簧配件，五金工具弹簧配件，出口服装的塑料弹簧配件，赌场筹码挂链，以及促销礼品，广告礼品等塑胶类挤出产品及配件。

Likewise, as construction enterprises are facing ever more intense market competition, and market competition in the construction enterprises can invincible, and the key lies in whether or not to provide superior quality, time limit for a project short, low-cost products, and enterprises can obtain certain results, the key lies in the availability of low cost.

同样，作为建筑施工企业也面临着更加激烈的市场竞争，建筑企业能否在市场竞争中立于不败之地，关键在于能否为社会提供质量优、工期短、成本低的产品，而企业能否获得一定的经济效益，关键在于有无低廉的成本。

This text passes and analyses network technology characteristic and the general demand for campus network at present and practical application, it accords with systematic model of campus network of the network application demand in the campus at present to probe into, have used "top-down design philosophy " in networking, have discussed that tightens mode, all netted modes, some netted structure modes, the third layer of network technologies of exchanging the mode, wait a moment to three swapper, division and some key equipment and development of application system of VLAN odd key technology problems go on research.

本文通过分析网络技术特点和目前校园网的普遍需求及实际应用，探讨符合目前校园网络应用需求的校园网系统模型，在网络建设中运用了"自顶向下"的设计思想，讨论了紧缩模式、全网状模式、部分网状结构模式、第三层交换模式的网络技术，对三层交换技术、VLAN的划分及一些关键设备和应用系统的开发等等几个关键技术问题进行了研究。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。