Superstition: There should always be a light burning in an empty theater to ward off ghosts.

迷信：鬼魂出没于剧院，应该给他们每周留一晚的时间单独上台。

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Actually, the complex shape and many kinds of values of "ghosts" cannot be covered by the significance "superstition", "ignorance", "backwardness" and so on.

其实，“鬼”的复杂形态与多种价值并不能以“迷信”“愚昧”“落后”等意义所涵盖。

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The souls of the dead were supposed to revisit their homes on Samhain, leading to the sinister superstition that ghosts, witches, devils, and fairies roamed the earth for that one day.

CNN: Happy Halloween