常見例句雙語例句In the early days of underground coal mining, pit canaries often had short but valuable lives.早期地下采煤的時候，礦井中的金絲雀常常擁有短暫而有價值的一生。Generally, underground coal mining starts from one side (dip most) and ends at the other side of the property.一般來說，地下煤炭開采從一個側(cè)面（浸最開始）和結(jié)束在另一側(cè) 該財產(chǎn)。While Shanxi provides the fuel that powers China's sizzling economy, thousands of acres of land are sinking because of the ravages of underground coal mining.然而，在山西省向中國高速發(fā)展的經(jīng)濟提供燃料時，由于煤礦對地下的破壞，導致當?shù)赝恋卣诖竺娣e下沉。權(quán)威例句And while it's true that's shrinking as a percentage of Alpha's business, because we're exporting a lot more coal this year than we have in the past, our domestic steel companies are scrambling to get coal since metallurgical coal comes mostly from underground mining.FORBES: Magazine ArticleCoal mining accounts for 90% of sales at Joy's underground division and 33% at its surface-mining unit (copper and other ores account for the rest).FORBES: The Big DigLouis-based Patriot Coal agreed to phase out its mountaintop excavationsand redirect its efforts back to underground mining.FORBES: A Turning Point for Mountaintop Removal Coal? 返回 underground coal mine