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伪顶 wěidǐng
tech. false roof; following dirt; following stone
伪顶位于煤层之上随采随落的极不稳定的薄岩层,厚度一般在0.5m以下 wěidǐng
expl. false roof
伪顶陷落,崩落 wěidǐng
gen. ramble
伪 顶: 2 phrases in 2 subjects
Ichthyology1
Technology1