第三段中心句：The shapes of medals change during the history of Olympics.
第四段中心句：At their most idealistic,the Olympics are supposed to unite the world through sport.
第三段中心句：The shapes of medals change during the history of Olympics.
第四段中心句：At their most idealistic,the Olympics are supposed to unite the world through sport.
本文标题：2017-10-28
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