/ˈtʌndrə ||; ˈtʌndrə/noun [U] (in geography 地理学) the large flat Arctic regions of northern Europe, Asia and North America where no trees grow and where the soil below the surface of the ground is always frozen 冻原，苔原（指欧洲、亚洲及北美洲北部的大片北极地区） ☞picture at ecosystem 见ecosystem插图