vainly hope for

例句：

1. 1.He hoped that his hard work would pay off, but he was vainly hoping.
   他希望他的辛勤工作能够得到回报，但他徒劳地希望。
2. 2. She tried to convince him that it was a good idea, but he was vainly hoping.
   她试图说服他这是一个好主意，但他徒劳地希望。
3. 3. The company's stock price had been rising steadily, but the investors were vainly hoping.
   该公司的股价一直在稳步上升，但投资者徒劳地希望。