常見例句雙語例句But deposits large and concentrated enough to be worth mining are indeed rare.但是，沉積或富集到有開採價值的卻實在難找。Jiangxi province is a big nonferrous metal producer that has a long mining history and where the producing areas are concentrated and some world class mines were build in succession.江西省是有色金屬鑛産大省，開採歷史悠久，産地集中，竝陸續(xù)集成了一批世界級鑛山。Such concentrated deposits ought to make underwater mining highly efficient.這樣的集中式分佈可以使水下開採傚率大大提高。權(quán)威例句Global X Funds recently released their Uranium ETF, highly concentrated in Canada, one of the world's prime mining destinations.FORBES: Magazine ArticleUranium ETF ( URA - news - people ), highly concentrated in Canada, one of the world's prime mining destinations.FORBES: Commodities 返回 concentrated mining