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Our results improve the former results. For periodic Jacobi matrix, some new spectral properties of periodic Jacobi matrix are given by studying the relationship of the eigenvalues of periodic Jacobi matrix and its n—1 principal submatrix. Applying these spectral properties, we present a necessary and sufficient condition for the solvability of an inverse problem of periodic Jacobi matrices and discuss the number and the relationship of its solutions. Furthermore, we propose a new algorithm to construct its solution and compare it with the former algorithms. As this inverse problem of periodic Jacobi matrix usually has multiple solutions as many other eigenvalue inverse problems, we study the uniqueness of this problem. And a necessary and sufficient condition is given to ensure its uniqueness, under which an algorithm is presented and the stability analysis is also given. Finally, we put forward a new inverse problem for periodic Jacobi matrix which has not been solved.

对周期Jacobi矩阵特征值反问题，通过研究周期Jacobi矩阵与其n-1阶主子阵特征值的关系，给出了周期Jacobi矩阵的一些新的谱性质；利用这些谱性质，研究了一类周期Jacobi矩阵特征值反问题，用新的方法推导出了该类特征值反问题有解的充分必要条件，并讨论了解的个数以及解与解之间的关系；此外，提出了一种新的构造周期Jacobi矩阵反问题解的数值算法，并与前人的算法做了一定比较；由于周期Jacobi矩阵特征值反问题和其他很多特征值反问题一样往往存在多个解，本论文给出了周期Jacobi矩阵反问题解唯一的充要条件，并发现周期Jacobi矩阵特征值反问题的解唯一当且仅当构造的矩阵满足一定的条件；在解唯一的情况下，给出了构造唯一解的数值算法，并做了相应的稳定性分析；最后，提出了一类新的有待于解决的周期Jacobi矩阵特征值反问题。

Russia is the Kremlin Palace of Czar history, magnificent momentum, the world-famous, the Supreme Soviet of the former Soviet Union and the former Soviet Union's Congress of the Communist Party Congress held in the Kremlin.

克里姆林宫是俄国历代沙皇的宫殿，气势雄伟，举世闻名，原苏联最高苏维埃代表大会和原苏联共产党代表大会都在克里姆林宫举行。

Of his 39 professional opponents, only two have had their hands raised after facing him: former titleholder Chris Byrd and former champ Lennox Lewis.

和他较量过的39位拳手中，只有两人获胜，即前拳王伯德和刘易斯。

Alongside them is an "anarchist" toff who lives in a stately home and a former Russian rock star who beds men and women. There is also a bisexual Brazilian, two blonde glamour models and a former Mr Gay UK contestant.

其中有多金的"无政府主义"牛津毕业生；双性恋前苏联摇滚明星；至今摇摆未定的巴西裔大学生，两位金发美女和一位前Mr Gay UK获奖爱秀男。

The gutted former headquarters of the former communist Mongolian People's Revolutionary Party in Ulan Bator.

前者的内脏总部前共产主义在乌兰巴托的蒙古人民革命党。

To sell their drugs, pharmaceutical companies hire former cheerleaders and ex-models to wine and dine doctors, exaggerate the drug's benefits and underplay their side-effects, a former sales rep told a Congressional committee this morning.

出售自己的药品，制药公司租用前拉拉队和易地模式，以酒和就餐医生，夸大药物的好处和underplay其副作用，一名前销售代表告诉国会一个委员会今天上午。

Here are the comrades in arms who studied together at the Marxist University of Dar Es Salaam, Tanzania: Yoweri Museveni, Uganda's president; Laurent Desire Kabila, the ADFL figurehead and assassinated president of the Democratic Republic of Congo; Meles Zenawi, president of Ethiopia; Isaias Afwerki, president of Eritrea; Africa scholar Mahmood Mamdani; former RCD leader Wamba dia Wamba; Paul Kagame, Rwanda's president; and John Garang (d. 2005), former leader of the Sudan People's Liberation Army and first president of South Sudan.

这里是战友谁一起研究马克思主义在达累斯萨拉姆大学，坦桑尼亚：约韦里穆塞韦尼总统，乌干达总统；洛朗卡比拉，解联傀儡，暗杀总统的刚果民主共和国；梅莱斯泽纳维总统埃塞俄比亚；伊萨亚斯阿费沃基总统，厄立特里亚总统，非洲学者马哈茂德Mamdani ；前民盟领导人万巴迪亚万巴；保罗卡加梅总统，卢旺达总统和加朗（草2005年），前总统苏丹人民解放军和第一任总统苏丹南部。

Two former American treasury secretaries, Larry Summers and John Snow, have discovered hedge-fund lucre, as has another former Washingtonian, Chelsea Clinton, the ex-president's daughter.

两位美国前财长Larry Summers和 John Snow以及另一个前华盛顿人，美国前总统的女儿Chelsea Clinton都已经发现到对冲基金的丰厚收益。

Ai Dongmei, a former Beijing Marathon champion, sold popcorn and clothing on the street. Zou Chunlan, a former national champion weight lifter, scrubbed backs in a bathhouse; she said a coach had given her steroids that produced side effects like facial hair and a deep voice. The All China Women's Federation later helped her open a laundry."There are many athletes like me who never get the help," Zou said by telephone.

北京马拉松冠军得主艾冬梅，曾经在街上卖过爆米花和衣服；世界举重冠军邹春兰，在控诉她的教练曾经给她服用过能让人面部长毛、声音变厚等的副作用的类固醇之后，中国妇女协会帮她开了一家洗衣店使她不用再在澡堂里为他人搓背求生。

Ai Dongmei, a former Beijing Marathon champion, sold popcorn and clothing on the street. Zou Chunlan, a former national champion weight lifter, scrubbed backs in a bathhouse; she said a coach had given her steroids that produced side effects like facial hair and a deep voice.

北京马拉松冠军得主艾冬梅，曾经在街上卖过爆米花和衣服；世界举重冠军邹春兰，在控诉她的教练曾经给她服用过能让人面部长毛、声音变厚等的副作用的类固醇之后，中国妇女协会帮她开了一家洗衣店使她不用再在澡堂里为他人搓背求生。

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。