an oxide of tin氧化锡Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见.Atoms of iron in the nail combine with atoms of oxygen from the air to form molecules of iron oxide, or rust.钉子里的铁原子与空气中的氧原子结合后形成氧化铁分子，也就是锈。...
The closure of the factory is a retrograde step .工厂的关闭是一大退步。Infection can spread retrograde down a drain from the exterior.感染能从外界经引流管逆行播散.The motion of the particle is retrograde.质点运动是衰减的....
The rescuers were beaten back by strong winds and currents.救援人员因风浪太大而被迫中断工作。A sudden break in the cloud allowed rescuers to spot Michael Benson.天气的突然放晴帮助救援人员找到了迈克尔·本森。Rescuers were still working their way towards the tra...