货币兑换成本仍是跨境贸易的最大障碍之一。Currency-conversion costs remain one of the biggest obstacles to cross-border trade.她从政期间是自由贸易的主要倡导者。She was a leading exponent of free trade during her political career.西非是可可豆贸易的中心。West Africa was th...
绿片岩相以下的动力变质作用是矿化富集的条件.Dynamical metamorphism under greenschist facies is the condition of mineralizing enrichment.卯独庆金矿床赋存在古元古代二道凹岩群的绿片岩层与大理岩层过渡带.Maoduqing gold deposit occurred in the green schist and marble stratum bel...