这种云只有在极地区域以及严寒的气温下才能形成。
The clouds form only in polar latitudes andatextremely cold temperatures.
在温带和极地地区适应季节的规律变化可能是相对简单的。
Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.
一旦扎根土壤，灌木林地就会生长茂盛，特别是在北极地区，因为北极地区的灌木丛比其他植物更善于利用土壤中的营养成分。
Once is established, shrubland thrives, particularly in the Arctic, because Arctic shrubs are good at taking advantage of increased nutrients in the soil, better than other Arctic plants.
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