light at the end of the tunnel idiom
隧道尽头的亮光，曙光（指局势出现好转或艰巨任务即将完成的迹象）
signs of improvement in a situation that has been bad for a long time, or signs that a long and difficult piece of work is almost finished
As finals approached, she felt that at last she could see the light at the end of the tunnel. 随着决赛的临近，她觉得自己终于快要熬出头了。