他们是传统的半定居部落，在定居点间季节性迁移。
They were traditionally semisedentary, moving seasonally between fixed sites.
一般来说，进行这种季节性往返迁移是为了寻找在一个地区无法全年获得的资源。
Generally, the reason for such seasonal back-and-forth movement is to seek resources that aren't available within a single area year-round.
它具有很强的吸附能凝聚水分，使包气带水和潜水从液态、汽态向冻结层迁移富集，形成季节性固态地下水。
The high absorption energy makes ground water in air containing zone move towards the freezing layer and produce seasonal frozen perched ground water.
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