以下为句子列表：
英文: So an equation, which calculates the annual times of pavement concrete natural freeze-thaw cycle was developed and the cycle parameters, including temperature decreasing speed of freezing, length of freezing time and lowest freezing temperature were stati
中文: 根据有限差分方法计算得到的我国主要城市铺面混凝土内部年逐时温度，进行了铺面混凝土冻融环境的量化指标统计分析，建立了铺面混凝土年冻融循环次数的预估方程，统计得到各量化指标的分布状况和特徵值。
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英文: The artificial freezing temperature field is an unstable transient heat conduction phenomenon related to space and time, as well as phase changing.
中文: 摘要人工冻结温度场是空间和时间相关且含有相变的不稳定瞬态传热问题。
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