Disney will claim its one billionth visitor before the end of the century.到本世纪末迪士尼将迎来其第十亿位游客。Well before a billionth of a second had elapsed the universe started to grow exponentially.十亿分之一秒远未逝去，宇宙已开始成指数级地迅速增大。This is the billionth time I've seen this show. 这个节目我看过无数次了。