frozen earth engineering
frozen earth exploration
Frozen earth in the plateau
frozen earth temperature field
frozen storage
冷冻冷藏
冷冻
冻藏时间
冻藏过程
冻藏
冷冻贮藏
冷冻保存
冷冻储藏
冷冻存贮
冻存
frozen storage condition
Frozen storage stability
frozen storage temperature
key bed of frozen earth
Maximum frozen earth depth