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The symmetric algorithm is a traditional algorithm, it is easy and efficient, and so it is still being popular used. The stream cIPher and the block cIPher are two part of the symmetric algorithm. The symmetric algorithm uses the key to control the key stream generator, and then the generator produces a random stream. We can get the cIPher by xor the message and the random stream by bit. In the field of communication and code, the stream cIPher has always been the key cIPher of the military affairs and foreign affairs.

对称密码体制分为序列密码和分组密码两类，序列密码以密钥控制密钥流发生器，产生一随机序列，用这个随机序列和明文信息逐位异或，就得到密文，其加密单元为比特。

Multiple letters are assigned to each key (the "2" key is also "ABC", for example), and tapping repeatedly on a key switches between its corresponding letters until the desired character is chosen.

每个按键上都有若干字母（比如"2"键上同时有ABC三个字母），只要重复按键就可以选择相应字母，直到选到你要输入的为止。

The definition of key constraints for XML and a sound and complete set of inference rules of absolute and relative key are given. An algorithm of solving candidate key for XML is presented, and validity, terminability and time complexity of that are proved.

给出XML键约束的完整定义以及绝对键和相对键的推理规则，提出多项式时间求解XML候选键的算法，并对算法的正确性、可终止性和时间复杂性进行了分析和证明。

In practice, key exchange, key transport, and key management is thorny at best.

在实践中，密钥交换，主要运输，和密钥管理是最棘手的。

The tilde is normally found to the left of the 1 number key above the backtick key, or try Shift plus the hash key if you have an English keyboard layout.

这个符号一般在中1键的左边，backtick键的上面，或者如果你有英语键盘布局，尝试Shift和hash键。

This paper has obtained following three results about the new scheme:(1) The hardness of recovering the private key from the public key is based on the hardness of the shortest vector problems of several lattices;(2) The hardness of forging a signature is equivalent to the hardness of the closest vector problem of some lattice;(3) Each signature will leak information on the private key,but the final shape of the unlimited leakage is just a group of complicated non-linear equations.

文中给出新方案的3个结果：(1)由公钥恢复出私钥的困难性基于若干格上的最小向量问题；(2)由公钥伪造签名的困难性等价于某个格上的最近向量问题；(3)每个签名值仍然会泄露私钥的一些信息，但无限制泄露的最终形式只是关于私钥的一组复杂的非线性方程。

Started from D-tyrosine, we obtained the tetramic acid 96 using Jouin reaction. The assembly of the second fragment 109 was stared from 1,4-butandiol,using asymmetric alkylation reaction developed by Oppolzer as a key step. Coupling of the tetramic acid 96 with 109 provided the key intermediate 110 according to Yoshii\'s procedure. After remove protective group and Sharpless epoxidation, we obtained the key intermediate 113. Its macrocyclization to form the final product is in progress.

本论文的第二章主要对Macrocidin A开展了合成工作，我们从D构型的酪氨酸出发，经过官能团转换；利用Jouin反应生成Tetramic acid 96，另外一个片断从1，4-丁二醇开始经过多步反应生成碘化物104，利用Oppolzer发展的手性樟脑磺酰胺为辅基参与的不对称烷基化反应，引入手性甲基，生成关键中间体109，接着通过Yoshii发展的方法连接96和109生成110，经过Sharpless不对称环氧化反应建立环氧化合物，然后脱去保护基得到关环前体113，分子内的Mitsunobu反应进行关大环反应正在进行之中。

We strengthened energy conservation in key industries, enterprises and projects, and conducted pilot projects to develop the circular economy. We worked hard to prevent and control water pollution in key river valleys and regions, such as the Three Gorges Reservoir area, the Songhua River, the sources and routes of the South-to-North Water Diversion Project, and the Bohai Sea. We carried out key environmental protection projects to desulphurize emissions from coal-fired power plants, treat urban sewage and dispose of waste safely.

积极推进重点行业、重点企业和重点工程的节能工作，开展循环经济试点，加强三峡库区、松花江、南水北调水源及沿线、渤海等重点流域和区域水污染防治工作，实施燃煤电厂脱硫、城市污水处理、垃圾无害化处理等环保重点工程。

In this study, the amount of ethylene and its key biosynthesis genes expression, typical allelochemical hydroxamic acid concentration and the key regulation genes (BX1 and BX9), as well as the dynamic expression and time of relevant defense key genes of secondary substance metabolism processes were compared in ethephon treatments of different concentration and duration.

为探明外源乙烯利对玉米化学防御作用诱导的浓度和时间效应，本文采用化学和分子生物学相结合的方法，研究了不同浓度乙烯利处理玉米后，叶片乙烯释放量及其合成调控关键基因ACS和ACO表达的变化，典型化感物质丁布的含量及其关键调控基因BX1和BX9表达的变化，以及其他调控次生代谢物的关键基因表达的时间动态。

The brigade of discharge, actually, update you every day, if do not go on your key word, also be infructuous, light gives you a good word, without material benefit, still do not have motivation, but, if update your station every day, so, the job with bad what is the key word that make a point also what is popular key word?

流量之旅，其实，天天更新你，如果你的关键字上不去，也是徒劳，光给你好话，没有实惠，还是没有动力，但是，如果天天更新你的站，那么，做点关键字也就不是什么难的事了什么是热门关键字？

I think people in this lifetime in a rebirth.

我觉得人在这一生里其实也在轮回。

He had to tie her hands together.

他不得不把她的双手绑在一起。