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A gentleman staying in a hotel left his umbrella in the hall, but he had put on the handle(伞柄) a card on which was written:“This umbrella belongs to a gentleman who can lift up a hundred pounds. I shall be back in ten minutes.”rnWhen he came back, he found, instead of his umbrella, another card on which was written:“This card belongs to a man who can run ten miles an hour. I shall not come back.”