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spontaneous
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a.自发的,自然产生的
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详细解释：
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以下为句子列表：
英文: Any circumstance that affects the amount of available insulin-like growth factor so as to modify the sensitivity of the ovary to follicle-stimulating hormone appears to govern the rate of spontaneous twinning,Steinman said in a statement.
中文: 斯汀曼在一份声明中提到：任何能影响类胰岛素生长因子分泌量的因素都会改变卵巢对促卵泡激素的敏感度，从而影响自然孪生的几率。
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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: 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: Aortic dissection. Pregnant women are at increased risk for spontaneous aortic dissection.
中文: 主动脉壁夹层形成妊娠妇女容易自发形成主动脉壁夹层。
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英文: Atrophie blanche is a disease of recurrent and spontaneous ulcerations of the lower leg, and it affects middle-aged women mostly.
中文: 摘要白色萎缩症是好发于中年女性下肢的反覆性及自发性溃疡之疾病。
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