He explained somewhat unconvincingly that the company was paying for everything.他解释说公司会支付一切费用，这个说法有点令人不能信服。"It's not that I don't believe you, Meg," Jack said, unconvincingly.“并不是我不相信你，梅格。”杰克口是心非地说道。" I can...
硫化物集体大部由磁黄铁矿 、 镍黄铁矿 、 黄铜矿及黄铁矿组成.The sulfide assemlage consists largely of pyrrhotite, pentlandite, chalcopyrite, and pyrite.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 found in association with magnetic...