Harry Potter and Viagra have more in common than you may imagine. They came to market within a year of each other in the late-1990s; they enjoyed enormous success; and what was a boon for the companies that produced and sold them could turn into a bane as their popularity fades and rivals emerge.
哈利?波特(Harry Potter)和萬艾可(Viagra)之間的共同點，比你想象的要多。它們都在20世紀90年代末上市，時間相隔不到一年；它們都取得了巨大的成功；隨著受追捧程度的下降和競爭對手的出現，對于制造和銷售它們的公司而言，曾經的福音都可能變成禍患。
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