以下为句子列表：
英文: Based on the investigation on the structure and niches of secondary forests in Jiulongkeng, Guangze, Fujian province, the distribution law was studied and natural succession tendency was worked out for primary arbors and shrubs in different slope directio
中文: 摘要通过对福建光泽九龙坑不同坡向天然次生林的林分组成和生境的调查，研究主要乔灌木树种在不同坡向林分中的分布规律，分析出不同坡向林分的天然演替趋势，为人工促进天然更新提供科学依据。
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英文: Based on the main tunnel for the water conveyance project of Dahuofang Reservoir in Liaoning Province, a simulation-based analysis is made on the tunnel structure with the finite element method (FEM); in which the stress distribution law of the tunnel str
中文: 摘要应用有限元法对辽宁省大伙房水库输水工程主体隧洞结构进行了仿真分析，从而得到隧洞结构的应力分布规律，研究确定薄弱部位并采取相应的稳定措施，以便保证隧洞施工的安全与经济。
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英文: In order to research the spatial distribution law of the regional industrial structure, the self organization maps method is used to cluster and analyze the regional data in China 2003.
中文: 摘要为了研究地区产业结构的空间分布规律，采用自组织映射的聚类方法，对2003年中国省级地区的产业结构进行了聚类分析。
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英文: The contract stress on supporting roller and crawler board surface of three models of Dong Fang Hong crawler tractor under three working conditions is gained by finte element analysis, as well as the stress distribution law and maximum stress which provid
中文: 摘要对3种机型拖拉机的支重轮与履带板之间的接触应力分别在3种工况下进行了有限元分析，得出接触应力分布的规律及其最大值，为解决支重轮和履带板的塑性变形问题及摩擦磨损行为分析提供了有价值的参考数据。
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英文: The distribution law of furan content in oil of large step-down transformers in Shanghai Grid is researched by statistical analysis. The cautions in its application are presented.
中文: 摘要利用统计分析技术，研究了上海地区电网大型降压变油中糠醛含量的分布规律，提出了在其应用中应注意的问题。
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