positive contraction meaning in English

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It is natural to ask the following question : what relationship is between g - matrix q and the infinitesimal generators of the positive contraction semigroups derived from g - matrix q
人们自然会提出如下问题： q -矩阵q与这些正的压缩半群的生成元之间有什么关系呢
According to the theory of continuous - time markov chains , given a g - matrix q , it is possible that there exist infinite transition functions and therefore there maybe exist infinite positive contraction semigroups ( co semigroups ) on l1 derived from q - matrix q . but each positive contraction semigroup has and only has one infinitesimal generator
给定一个q -矩阵q ，可能存在无穷多个转移函数，从而在l1空间上可能有无穷多个正的压缩半群( c _ 0半群)与之对应，而每个正的压缩半群有且仅有一个无穷小生成元。