（四）为维护国家安全、实施国家重大战略确需开展的活动，以及无法避让的国家重大项目建设；
Equal (6): Everything in this space must be equal to 6. The answer is 6-2, placed vertically; 6-3, placed horizontally.
。体育直播对此有专业解读
（三）天灾，海上或者与海相通的可航水域的危险或者意外事故；。关于这个话题，服务器推荐提供了深入分析
Green: College basketball tournament。业内人士推荐体育直播作为进阶阅读
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