Job troubles top the list of stress factors for Americans today.工作烦恼位列当今美国人压力因素之首。The Tower of London tops the list of London's most popular tourist attractions.伦敦塔在伦敦最受欢迎的旅游景点中名列第一。Who tops the list this year for Hollywood's highest-paid actor? 谁是今年好莱坞薪酬最高的演员？