前陆

例句：

1. 1. The geological survey team has discovered a new frontier in the study of ancient volcanic activity.
   地质调查队在研究古代火山活动方面发现了一个新的前沿。
2. 2. The construction of the new bridge will change the landscape of the city's frontier area.
   新桥梁的建设将改变城市边缘地区的景观。
3. 3. The frontier region is rich in natural resources and has great potential for development.
   边疆地区资源丰富，发展潜力巨大。