1. That must be the oval unroofed amphitheater in Rome. It was basically a stadium with comprehensive functions.
   那就是罗马的椭圆型露天竞技场了，基本上是综合功能的体育场。
2. The change from the unroofed stadiums to sealed off buildings maybe the beginning that tickets were sought.
   从露天场馆到封闭的建筑的转变，就可能是追求门票收入的开始。

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