在二叠纪时期，地球上的大陆开始合并形成一个超级大陆。

During the ___Permian period, Earth's continents began to merge into a single supercontinent.

许多石油工人搬迁到德克萨斯州，在二叠纪盆地工作。

Many oil workers moved to Texas to work in the ___Permian Basin.