mean annual ground temperature
地温年振幅 annual amplitude of temperature in ground 年平均地温 mean annual ground temperature 冻土含水量（冻土总含水量） water content in frozen soil ..
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mean annual ground temperature
年平均地温
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
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