以下为句子列表：
英文: A new method of absolute calibration of photodetector sensitivity based on spontaneous parametric down-conversion(SPDC) biphoton field is described.The process of SPDC is studied theoretically.The single photon detection probability and two-photon coincid
中文: 讨论了一种基于自发参量下转换双光子场绝对校准光电探测器灵敏度的新方法，着重推导了对自发参量下转换过程中产生的单光子的探测概率和双光子的符合速率，从而阐明了绝对测量光电探测器量子效率的原理.基于这一方法对光子计数型光电倍增管的响应灵敏度进行了测量，并将实验结果与常规方法测得的结果进行了比较.
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英文: Abstract Recurrent spontaneous abortion (RSA) is defined as three or more consecutive pregnancy losses prior to the 20th week of gestation.
中文: 复发性自然流产（RSA）的定义是连续3次或以上在妊娠20周前发生妊娠的终止。
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英文: Abstract: By analyzing the double meaning of the effect mechanism of water on the oxida tion and spontaneous combustion of residual coal in goaf, and through investigat ion of the results both in laboratory and field practice, it is confirmed that w ater
中文: 文摘:通过对水在采空区遗煤氧化及自燃的作用机理两重性的分析以及实验室试验与现场应用实际效果研究，证实了笔者提出的清水灌注措施是一种新的、经济有效的、操作简便的防治采空区遗煤自燃的技术措施。
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英文: Abstract: The article analyzed the thick seam duplicate to pick has the spontaneous combustion influence factor, introduced the multi-association two ore first well used the synthesis measure, enhanced the mine shaft fire area fire fighting efficiency the
中文: 摘要：文章分析了厚煤层复采发生自然发火的影响因素，介绍了多联二矿一号井采用综合措施，提高井下火区灭火效率的经验。
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英文: Abstract: The simplified one-dimensional mathematical model of spontaneous heating process is used to analyze the effect of the change and movement of water vapour in coal stock pile on the maximum temperature reached during the self-hearting of the coal
中文: 文摘:利用简化的自热过程一维数学模型，分析煤堆内水分变化及迁移对煤堆自热所能达到的最高温度的影响。
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