本文运用数理统计方法，并结合现代生态学领域中较新的理论，对四川兴文地区长兴阶的三个古群落进行了结构模式和群落的更替分析。
This paper analyses the structural pattern and community succession of three Changhsingian paleocommunities in Xingwen area by the mathematical statistics method and modern ecologic theory.
依存状态所有权理论和控制权理论都无法准确地解释企业领导人更替问题。
The succession of corporate leaders can't be explained by dependent ownership theory and control right theory.
现代科技的迅猛发展及其在军事领域的广泛应用，引发了军事思想和战争理论的巨大变革，加快了新战法、新理论的推陈更替。
Military idea and war theory had changed greatly on account of the rapid development of modern science and technology and its application widely in the area of military.
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