In graphite sheets, carbon atoms bond together in rings.石墨层中的碳原子相互连接形成碳环。Made from cast iron, it is finished in graphite enamel.它是用铸铁制成，最后在外面搪了一层石墨。A powerful electric current is passed through a piece of graphite.给一块石墨通...
该竞技场为四周封闭式结构,可以举行斗剑 、 格斗 、 斗兽及其他竞赛项目.The amphitheater was a sealed off round structure . Swordplay, wresting, gladiatoral and other contests were held there.最高楼层将以世界最高的 非 封闭式观察台为特色.The uppermost floors will feature the w...
The division of Europe into warring blocs produces ever - increasing centrifugal stress.把欧洲分为作战集团产生了越来越大的离心效果.The custom traces to the time of the Warring States.这个风俗可上溯到战国时代.She would willingly forgo a birthday treat if...