以下为句子列表：
英文: A mass screw was finally selected as its conveying mechanism and various parameters were analyzed, so that a theoretic basis was provided for design of a screw conveying mechanism.
中文: 最终采用实体螺旋作为送料机构，并从理论上对送料机构的各个参数进行了分析，为螺旋送料机构的设计提供了理论依据。
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英文: A systematic theoretic framework is proposed to calculate the trapped magnetic field and temperature distributions in a superconducting disk magnetized by a field-cooling process.
中文: 摘要本文提出了一个系统的理论框架计算通过场冷过程磁化的超导圆盘中的俘获场和温度分布。
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英文: A third-order Tracking differentiator is presented, then it's convergence is proved from two aspects-continuity and discrete, and which is a theoretic base for its application.
中文: 摘要首先给出了一种三阶线性跟踪微分器的结构形式，然后从连续和离散两个方面证明了其收敛性，为其实际应用提供了理论依据。
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英文: Abstract: Considering the cutting tool's dynamic intensity.This paper made optimization about the cutting value of higher chromium which cast iron, and put forward a theoretic foundation which can be used to cut higher chromium white cast iron with cerami
中文: 文摘:考虑刀具动态强度条件下，对用陶瓷刀具加工高铬铸铁的切削用量进行了优化计算，从而为用陶瓷刀具经济性地加工高铬铸铁提供了理论依据。
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英文: Abstract: In the form of interlocution, this article discusses a few theoretic questions on disaster and famine history:the relationship between the local government and the central government; the problems of replacing relief by loan in Hunan Province;th
中文: 文摘:以问答形式，探讨灾荒史研究的几个理论问题：地方政府与中央政府的关系；关于湖南改赈为贷的问题；传统社会与近代社会荒政的差异；政府和民间人士在赈灾活动中的地位。
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