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 tun·dra /ˈtʌndrə ||ˈtʊn-/
 苔原,凍土地帶

 Tun·dra n.  One of the level or undulating treeless plains characteristic of northern arctic regions in both hemispheres; the term is most commony associated with the arctic plains of Siberia.  The tundras mark the limit of arborescent vegetation; they consist of black mucky soil with a permanently frozen subsoil, but support a dense growth of mosses and lichens, and dwarf herbs and shrubs, often showy-flowered.
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 tundra
      n : a vast treeless plain in the arctic regions between the ice
          cap and the tree line