冻土层 dòngtǔcéng permafrost Origin Definitions Defs Strokes Stroke Words Sentences Sents 冻土 凍土 dòngtǔ noun frozen earth frozen earth; permafrost; tundra; soil or loose rock in high altitudes or high latitudes where moisture has frozen层 層 céng noun layer A physical sheet, thickness of material, or stratum covering a surface