在苏联、加拿大或阿拉斯加的永久冻土地区，冰一直很有效地用来做墙和屋顶。
In permafrost areas in the Soviet union or Canada or Alaska, ice has been used effectively for walling and roofing.
在苏联、加拿大或阿拉斯加的永久冻土地区，冰一直很有效地用来做墙和屋顶。
In permafrost areas in the Soviet union or Canada or Alaska, ice has been used effectively for walling and roofing.
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