永久冻土 yǒngjiǔdòngtǔ permafrost Definitions Defs Origin Strokes Stroke Words Sentences Sents 永久冻土 永久凍土 yǒngjiǔdòngtǔ permafrost soil or rock that remains frozen for at least two consecutive years
永久冻土 永久凍土 yǒngjiǔdòngtǔ permafrost soil or rock that remains frozen for at least two consecutive years
