请总结下面这段莎士比亚的引语“All the world's a stage, and all the men and women merely players; they have their exits and their entrances, and one man in his time plays many parts, his acts being seven ages.”
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这段引语将人生比作舞台，每个人都是舞台上的演员。人们在一生中经历不同的阶段，扮演多种角色，整个生命过程被分为七个阶段。
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