词语低级煤
解释lean coal
lean coal〔名词〕瘦煤,短焰煤详细»
lean coal〔名词〕低级煤,瘦煤,短焰煤详细»
低级煤grizzle;low-grade coal详细»
低级煤grizzle详细»
低级煤inferior coal;lean coal;low rank coal;low-grade coal;poor grade coal详细»