Imagination: refers to the psychological process of the human brain to process and transform the images formed in the past to produce a new image. Imagination includes unintentional imagination, intentional imagination and fantasy. Based on the above definition, which of the following is options that are not imagined? ['Bypassing by category.', "Russia's Moisky observes the flight of birds to make the first aircraft.", 'Rizhao incense burner produces purple smoke. Looking at the waterfall hanging from the Qianchuan River, the stream flows down three thousand feet. It is suspected that the Milky Way fell for nine days.', 'Goddess Peak of the Three Gorges, Huangshan welcomes pine.']