求翻译：大千世界中，任何事物都具有双面性。大人们的阅历丰富，决定了他们看东西比较全面。而孩子要走向成熟，就必定需要经历一些事情。有人说：“生活是一个大练兵场，是磨砺人的舞台。”在这个特殊的舞台上，每个人将会遇到开心的事情与悲哀的事情。悲哀的事情会使人承受巨大痛苦，开心的事物会让人拥有美好的心情。如果整日面对悲事，人容易丧失信心进而自暴自弃、颓废沉沦；而整日面对喜事，人又会被眼前的事物所迷惑，缺乏社会经验，容易上当受骗。正如植物不能缺少阳光与雨水一样，人的经历中不能缺少快乐和悲伤。是什么意思？

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