mirage
noun [ C ] uk/mɪˈrɑːʒ/ us/mɪˈrɑːʒ/
海市蜃楼，蜃景，幻景
an image, produced by very hot air, of something that seems to be far away but does not really exist
literary幻想，妄想
a hope or wish that has no chance of being achieved
Electoral victory is just a distant mirage. 选举获胜只是一个可望而不可即的美好幻景。