Or visit the library and check out the newly expanded Math and Science section!

或者到图书馆，去看看数学和科学类新近上架的书本！

Over the next thousand years, different ruling dynasties repaired, rebuilt, or expanded sections of the wall.

在后来的几千年，不同的统治王朝修复、重建，或者是扩张了城墙的某些部分。