土层 tǔcéng soil layer Origin Definitions Defs Strokes Stroke Words Sentences Sents 冻土层 dòngtǔcéng permafrost a subsurface layer of soil that remains frozen throughout the year, often found in polar regions or at high altitudes墓坑夯土层 mùkēnghāngtǔcéng rammed earth layer layer filled with rammed earth in a tomb pit (archeology)