这个古罗马圆形剧场每年夏天都会举办戏剧表演。

The ancient Roman ___amphitheater hosts drama performances every summer.

这座古老的圆形剧场曾经举办过许多戏剧表演。

Many theatrical performances were held in this ancient ___amphitheater.

我们在山谷中的天然圆形剧场里露营，四周都是陡峭的岩壁。

We camped in the natural ___amphitheater of the valley, surrounded by steep cliffs.