旷古

例句：

1. 1. The ancient city has been well-preserved for centuries.
   这个古老的城市经过几个世纪仍然保存完好。
2. 2. Ancient Egypt was a time of great advancement in science and technology.
   古埃及是科学和技术发展的一个黄金时代。
3. 3. Many ancient civilizations were built on the ruins of their predecessors.
   许多古代文明是建立在前朝废墟之上的。