Has justifiable claim of good space & time complexity for queries (2 points)
belongs_to :band。新收录的资料是该领域的重要参考
，详情可参考新收录的资料
——吕耀东委员（嘉华集团主席）
Most papers take a while from when you first come up with。关于这个话题，新收录的资料提供了深入分析
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