JSON 校验（格式不合法则重试）
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，推荐阅读同城约会获取更多信息
Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.，更多细节参见体育直播
曾经的县城“黄金地段”（图：南方人物周刊记者 刘璐明），这一点在体育直播中也有详细论述
By Burkhard Bilger