mountain pine beetle

例句：

1. 1.The mountain pine beetle is a major pest in the forests of the Pacific Northwest.
   松树毛虫是太平洋西北部森林的主要害虫。
2. 2.The mountain pine beetle has been found to have a devastating effect on the local ecosystem.
   松树毛虫被发现对当地生态系统产生了毁灭性的影响。
3. 3. Researchers are trying to develop new treatments for the mountain pine beetle.
   研究人员正在尝试开发新的治疗松树毛虫的方法。