以下为句子列表：
英文: Abstract: Characterized by vast coverage and extra intensity, soil erosion in the Upper Yangtze River Valley has become an important indicator of the ecological and environmental deterioration in the region.
中文: 文摘:长江上游水土流失面积广，侵蚀强度大，是其生态环境退化的重要标志。
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英文: Abstract: Polyphenylacetylenes were synthesized by ［Rn(nbd)Cl］2 and WCl6/Ph4Sn catalyst systems in N2 at room temperature.Polymers with high yield and high molecular weight were obtained.Their structures were characterized by UV,IR,NMR and GPC,respectivel
中文: 文摘:使用有机金属铑、金属钨/四苯基锡催化剂体系聚合苯乙炔，分别获得了高产率和高分子量的聚苯乙炔.使用UV，IR，NMR，GPC等分别对聚合物结构进行了表征.采用不同波长的激发光对聚合物荧光性能进行研究，详细分析了聚合物结构与荧光性能之间的关系.研究结果发现，不同聚合物结构对聚合物荧光性能产生很大影响，规整性高的聚合物，将有较高的发光量子效率；聚合物规整性差，将可能导致多个荧光发光结构点，其荧光强度降低.聚合物荧光光谱研究将对某些共轭聚合物结构的规整性分析提供一些有用的信息.
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英文: Abstract: The forest-steppe ecotone in northern Hebei and eastern Inner Mongolia is characterized by high biodiversity.
中文: 文摘:河北北部、内蒙古东部森林-草原交错带富于高的生物多样性。
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英文: As a famous comtemporary proser in Taiwan, Lin Qin-xuan takes a close look at the world with a strong compassion, thus his prose is characterized by a simple, plain and fresh style.
中文: 摘要林清玄是台湾当代重要的新生代散文家，他用一颗菩提之心关注现世人生，显现出博大的悲悯情怀，其散文也呈现出质朴、清新、真纯的特点。
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英文: As a new type of direct-drive motor with special structure, voice-coil actuator is characterized by being of high acceleration, high speed, smooth force, fast actuation and so on.
中文: 在此基础上分别给出了直线音圈电机和旋转音圈电机的选型计算方法，并对音圈电机的应用场合进行了详细介绍。
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