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海市蜃楼;幻境
A mirage is something which you see when it is extremely hot, for example in the desert, and which appears to be quite near but is actually a long way away or does not really exist.
例句
Through my half-closed eyelids I began to see mirages...
透过我半睁半闭的双眼，我看到了海市蜃楼。
It hovered before his eyes like the mirage of an oasis.
它在他眼前晃动，好像海市蜃楼里的绿洲。