futile /ˈfju:tail/ adj.琐细的；无用的，无效果的：Their efforts to revive him were futile.他们对他抢救无效。The president described these activities as futile.总统把这些活动形容为白费工夫。Their attempts were impressive but ultimately futile. 他们的努力让人印象深刻，但终归徒劳无益。