伪顶 wěidǐng false roof Definitions Defs Origin Strokes Stroke Words Sentences Sents 伪顶 (偽頂) wěidǐng false roof a thin layer of unstable rock immediately above a coal seam that tends to fall during extraction Sources Definitions CC-CEDICT
伪顶 (偽頂) wěidǐng false roof a thin layer of unstable rock immediately above a coal seam that tends to fall during extraction Sources Definitions CC-CEDICT
