seasonally frozen ground

基本解釋

In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics.
活動層夏季融化、冬季凍結(jié)的近地表土（巖）層，是凍土地區(qū)熱力動態(tài)最活躍的巖層，在凍土研究中有著重要意義。
It is shown from the results that seasonally frozen ground evidently influences site dynamical characteristics and seismic security of tank.
結(jié)果表明：季節(jié)性凍土層的存在明顯地影響著場地動力特性，進而影響儲罐的抗震安全性。
Water migration and variation in subgrade soils is the most active and live factor to the road frost damage in seasonally frozen ground regions.
在季節(jié)凍土區(qū)，路基水分遷移變化是道路凍害最積極活躍的因素。