凍土層 [冻－层]

Jyutping dung3 tou2 cang4
Pinyin dòng tǔ céng

Definitions (CC-CEDICT)
  1. permafrost
  2. tundra
  3. layer of frozen soil
Definitions (Wiktionary)
  1. noun
    permafrost; layer of frozen soil
  2. noun
    tundra