山区居民已经适应了恶劣的条件。

The mountain dweller has adapted to the harsh conditions.

山区居民经过几代人适应了恶劣的气候。

Mountain dwellers have adapted to the harsh climate over generations.

山区居民与沙漠游牧部落的长期争夺招致了无休无止的战争，

The constant rivalry between the mountaineers and the desertnomads led to endless warfare.