const realIdx = i % len; // 取模映射到真实数组索引，模拟循环
'A dangerous precedent'
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（四）违反有关法律法规规定，升放携带明火的升空物体，有发生火灾事故危险，不听劝阻的；
Plato (left) imagined humans were once whole, with four arms, four legs and two faces, before Zeus (right) split them, leaving each half searching for its other