Yanshanian

例句：

1. 1. TheYanshan Mountains are a popular tourist destination.
   燕山山脉是一处受欢迎的旅游胜地。
2. 2. The Yanshan Mountains are home to many rare and endangered species.
   燕山山脉拥有许多稀有和濒危物种。
3. 3. The Yanshan Mountains are known for their beautiful scenery and natural beauty.
   燕山山脉以其美丽的风景和自然美景而闻名。