以下为句子列表：
英文: Abstract: This paper introduces the wonderful cutting and welding properties of LPG（Liquefied Petroleum Gas）and its lower cost . thus ,the application of LPG is an effctive methods that can improve product quality and reduce cost and benefit the enterpris
中文: 文摘:介绍了液化石油气良好的切割和焊接性能以及燃气成本显著降低的特点，从而液化石油气的应用成为企业提高产品质量，降低成本、增加效益的有效途径之一。
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英文: With the study of characteristics of historical living street blocks, the paper mainly analyzes the value of historical living street blocks reuse and makes the analysis of cost and benefit about it.
中文: 摘要该文以研究居住性历史街区的特徵入手，著重分析居住性历史街区再利用的价值基础，并进行再利用的成本效益评价。
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英文: There is a balance between cost and benefit of horned lark and small skylark in nest-site selection.
中文: 这两种百灵鸟类在巢址的选择上存在着一种代价和利益的权衡关系 ,巢址选择是捕食压和热条件共同作用的结果。
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