map principal point 地图主点
Principal light rail route map 主要轻轨线路图
·2,447,543篇论文数据，部分数据来源于NoteExpress
The court said political map-makers cannot use race as the principal consideration in drawing congressional district boundary lines, but also agreed that using race as one factor could be constitutional.
CNN: AllPolitics - No To Gerrymanders
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