That must be the oval unroofed amphitheater in Rome. It was basically a stadium with comprehensive functions.
那就是羅馬的橢圓型露天競技場了, 基本上是綜合功能的體育場.
《簡明英漢詞典》
The wind unroofed the barn.
風(fēng)掀掉了谷倉的頂.
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At that night, the strong wind unroofed the barn and a dog barked.
那天夜里, 狂風(fēng)掀翻了谷倉的頂,狗兒也吠叫起來.
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In 7 th century BC, Romans inherited the traditions of Greece and built racetracks and unroofed amphitheaters.
公元前七世紀(jì)時羅馬人繼承希臘傳統(tǒng),就修建了賽馬場和露天競技場.
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"an unroofed shed"