肯尼亚的罗伯特·基布是800米决赛入围者中速度最快的选手.Kenya's Robert Kibe was the fastest qualifier for the 800 metres final.在我看来，罗伯特爵士的争辩纯属瞎说。It seemed to me that Sir Robert's arguments were nonsensical.罗伯特失足滑下了河岸。Robert lost his foot...
最具有经济价值的铁矿包括磁铁矿和赤铁矿.Iron ores of greatest economic interest contain magnetite and hematite.这是因为氧化磁铁矿蜕变.This is because the oxidation breaks down magnetite.某些贱金属以及金常常与磁铁矿和磁黄铁矿这类磁性矿物一起被发现.Base metals and gold are often fou...