After 300 years, metal constructions such as the Eiffel Tower or steel bridges will start to break, since, for all these years, there won't be anybody around to paint and protect from corrosion.

三百年后，像艾菲尔铁塔或铁桥那样的金属建筑物会开始崩坏，因为这些年来，周遭不会有任何人粉刷并防止锈蚀。