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The 75-kilogram helicopter will make a demonstration flight in the city of Vinci, near Florence, on May 25, according to Japanese developer Gennai Yanagisawa, 75. 據(jù)75歲的日本研發(fā)者平賀柳澤介紹，這架重75公斤的直升機(jī)將于本月25日在佛羅倫薩附近的達(dá)芬奇市進(jìn)行試飛。