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When we watch a person running about looking for sth. in a field, the wise man can set a puzzle for all the spectators to solve:What has person lost? 儅我們看見一個人在一片田野裡跑來跑去在尋找東西時，智者出一個難題給旁觀者去廻答：那個人失掉了什麽呢？ blog.sina.com.cn