尽管很多国家的恶作剧达人和笑话达人正兴高采烈地准备在愚人节拿爱人和朋友开涮，但没有人知道这种习俗开始的确切时间、原因、甚至地点。

Though pranksters and joke-lovers in many countries now gleefully prepare to dupe friends and loved ones on April Fool's Day, no one knows exactly when or why, or even where, this tradition began.

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