求翻译：The ego develops from around the age of two years and operates by the reality principle. The part of the personality which balances the fulfilment of basic instincts with what is socially acceptable. The id cannot be allowed to have its own way, so the ego often has to battle with it. Freud claimed that it was a mistake for the ego always to inhibit the id and believed that people should sometimes ‘let go’ and enjoy themselves. If this does not occur, he maintained that our id could become very frustrated and possibly achieve its own way at the wrong place or time.是什么意思？

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