1、The shipwreck was discovered at the bottom of the ocean, revealing a gigantic structure that had been hidden for centuries.

沉船在海底被发现，展示出了一个巨大的、数百年来一直被隐藏着的结构。

2、The concert was held in a gigantic stadium that could accommodate tens of thousands of people.

音乐会在一个可容纳数以万计人的巨大体育场举行。