副极带气候
The pattern of the pipeline's up and down route is determined by the often harsh demands of the Arctic and subarctic climate, the tortuous lay of the land, and the varied compositions of soil, rock, or permafrost ( permanently frozen ground).
管道这种或上或下的路线决定于严酷的极带和副极带气候、复杂的地形和构造各异的土壤、岩石、永久冻土。
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