求翻译：四，日美同盟强化的深层原因。这部分内容比较多，分别从：美日双方都谋求同盟整体功能最大化与同盟运行成本最小化、日美同盟需要通过强化以相互约束、日美双方对同盟未来的较高预期、日本与强者结盟的外交传统的影响、美国有做“离岸平衡手”的用意、日本树立新的外交形象的需要、两国相似的社会制度与价值观念、共同应对非传统安全问题等7个方面进行论证。是什么意思？

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