in vain hope

例句：

1. 1. Despite all our efforts, the projectstill fell through in vain hope.
   尽管我们尽了所有努力，但项目还是以徒劳的希望告终。
2. 2. Theold man's wordswere a reminder of the futility of his hopes.
   老人的话提醒了我们，他的愿望是多么的徒劳。
3. 3. Her dreams were in vain hope,as she never managed to achieve them.
   她的梦想是徒劳的希望，因为她从未实现过它们。