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Firstly, this paper puts forward an improved authentication and key distribution scheme for internet environment, in which we adhibit multilevel authentication center, encryption technology of DES, RSA and one-way function to actualize the safety of communication among the different user on network and reduces the workload of the authentication institution; at the same time, this scheme can also assure the security of network. Besides, it use the temporary symbol and the responds" sign of both-side correspondent to replace time stamp and applies them to internet communication to countercheck "rebroadcast attack and accordingly resolves the problem that it needs synchronization for network clock.

本文在首先提出一种改进的Internet网络环境下的认证及密钥分配方案，该方案考虑采用了多级认证中心，DES、RSA和单向函数加密机制，实现了网络上不同用户间的安全通信，降低了网上认证机构的工作量，同时也能够保证网络的安全性；并用通信双方的临时标志和响应者标识来代替时间戳应用于Internet通信中以防止"重播"攻击，从而解决了以往需要网络时钟同步这一难题。

The establishment of divorce compensation for damage regulation in marriage law is a sign of further perfection of our country's compensation for damage regulation.

离婚损害赔偿制度在婚姻法中的确立，标志着我国损害赔偿制度的进一步完善。

As a stranger entered a little country store, he noticed a sign warning, Danger!

作为首次到这个乡村小店的人，他注意到一个粘在玻璃门上的警告牌：危险！

As a stranger entered a little country store, he noticed a sign warning,"Danger!Beware of dog!"

一位陌生人走进了一家乡村商店，他注意到一个贴在玻璃门上的警告标志：危险！

As a stranger entered a little country store, he noticed a sign warning,"Danger! Beware of dog!"

当一个陌生人进入一家小乡村商店时，他注意到玻璃门上的一个警示标语危险！

Beware of Dog! As a stranger entered a little country store, he noticed a sign warning, Danger!

小心有狗一个陌生人走进一家乡村卖店，他看到一张告示贴在玻璃门上：危险！

Would he consider this court-martial to be a sign that it was affecting them?

他将会考虑这一个军事法庭是一个它正在影响他们的符号吗？

But when i look down into the courtyard, there's no sign of anyone there.

可是当我看向庭院的时候，却没有看到一个人人影。

Before I graduated in June also four Coutts, if I have not had the opportunity to sign a formal work ah?

我毕业前六月份还可以考茨四级，如果我过了有没有机会签正式工啊？

It is the sign of a great covenant between Man and God .

它是人与神的伟大契约的标志。

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。