The main problems which invariant theory research are the set of generators of invariants, the defining relations of the generators of invariants, the structure of invariant ring, and so on.

不变理论研究的主要问题是不变环的生成元集合，生成元之间的定义关系及环结构等等。

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By defining adjacent relations among the components of a chaotic sequence, we introduce a method based on network adjacent graph to depict the randomness of this sequence.

通过定义混沌序列中元素之间的邻接关系，提出了一种基于网络邻接图的方法来刻画此序列的随机性。

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On the basis of defining the concept of human factor in the international relations, it analyses why it must study the human factor in order to study the international relations.

在界定什么是“国际关系中人的因素”的基础上，分析了研究国际关系为什么要研究人的因素。

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The ranking Democrat on the House International Relations Committee, Tom Lantos, describes this as a defining moment in bilateral relations.

NPR: Congress Moves Toward Approval of India Nuclear Agreement

Nevertheless, it is this public perception that justice has not been done which has turned this wanton stabbing into a defining moment for race relations in Britain.

ECONOMIST: Crime and policing

Then came the events of 11 September 2001 that became the defining feature of his presidency, leading to a dramatic change in Pakistan's relations with the rest of the world.

BBC: Profile: Pervez Musharraf