The erection of the new hospital took several years.

造这所新医院用了几年时间。

Consisting of concentric circles of stone surrounded by a moat (called a "henge"), Stonehenge was constructed in several stages over thousands of years.

由圆石壕沟包围几圈巨大的同心圆石块组成，巨石阵的造持续了数千年时间。