mirage

mirage
[ˈmɪrɑːʒ, mɪˈrɑːʒ]
noun
  1. an optical illusion caused by atmospheric conditions, especially the appearance of a sheet of water in a desert or on a hot road caused by the refraction of light from the sky by heated air
    海市蜃楼;幻景
    ■something that appears real or possible but is not in fact so
    幻想;妄想
    to insist that science provides cast-iron knowledge is to believe in a mirage.
    坚信科学提供确凿知识等于相信幻想。
语源
  1. early 19th cent.: from French, from se mirer 'be reflected', from Latin mirare 'look at'
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