北京是世界上最陈旧的都邑之一。

Beijing is one of the oldest cities in the world.

youdao

它可以将用得最多的条目保存，同时又将最陈旧的和最少用到的条目清除。

It can keep the most used entries around while purging the oldest and least used.

youdao

中国正强制关闭一些最陈旧和最糟糕的污染源，升级和翻新工厂，并建造新型厂房。

The country is forcing the closure of the oldest and worst sources of pollutants, upgrading and retrofitting factories where possible, and building new plants.

youdao