anticlimax
noun [ C or U ] uk/ˌæn.tiˈklaɪ.mæks/ us/ˌæn.t̬iˈklaɪ.mæks/
扫兴，扫兴的结局
an event or experience that causes disappointment because it is less exciting than was expected or because it happens immediately after a much more interesting or exciting event
When you really look forward to something it's often an anticlimax when it actually happens. 你期盼的事情一旦成真时，你却常常会感到并不如想象的那样令人兴奋。
Coming home after a trip somewhere is always a bit of an anticlimax. 在一个地方旅游结束回家时，总会感到有些失落。
Even when you win a match there's often a sense of anticlimax - you always feel you could have played better. 即使在赢了比赛的时候，你也常会有一种不尽人意的感觉——总是觉得本来可以打得更好一些。