以下为句子列表：
英文: Considerable efforts has been made to investingate dynamic hysteresis and scaling behavior both theoretically and experimentally in the past twenty years.
中文: 在此方面，二十年来，已经有不少实践和理论的工作发表。
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英文: Feeding, ingate design, air discharge, position of signal wire were analysed and discussed, aiming at the several questions in production of low pressure casting.
中文: 摘要根据低压铸造工艺的特点和生产实践，从补缩、内浇道设计、排气、信号线安放位置等方面进行了分析和探讨。
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