unchanged

Despite the rapid development of the city, this remote mountain village has remained largely unchanged for a century.

(Chinese) 尽管城市发展迅速，但这个偏远的山村在一个世纪里基本保持原样。

The scientist confirmed that the chemical structure of the sample was unchanged even after being exposed to extreme heat.

(Chinese) 科学家证实，即使暴露在极端高温下，样品的化学结构也没有发生改变。