Talk about doing good by stealth: and in case you wonder, I heard the story from the poorer roommate, who had got suspicious and, ten years later, forced the richer one to confess.

• 说到悄悄地做好事，倘若你想知道，这故事我是听那位较贫困的室友讲的，他当时对此已有怀疑，十年后他逼那位富裕的学生招认了事情的经过。