请帮忙找错:A mirage is an (atmospheric) optical illusion (in what) an observer sees a nonexeistant body of water (or) an image of (some object)

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2001-12-26 -05:00

回到话题: 请帮忙找错:A mirage is an (atmospheric) optical illusion (in what) an observer sees a nonexeistant body of water (or) an image of (some object)

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