Law and Features of Surface Ground Movement in Fully-Mechanized Coal Mining with Caving of Roof Coal under the Condition of Ultra-thick Alluvial Deposit是什么意思_Law and Features of Surface Ground Movement in Fully-Mechanized Coal Mining with Caving of Roof Coal under the Condition of Ultra-thick Alluvial Deposit在线翻译_英语_读音_用法_例句