前线的

例句：

1. 1. The soldiers were sent to the frontline to fight the enemy.
   士兵们被派到前线去与敌人作战。
2. 2.The scientist was working on a frontline research project.
   这位科学家正在从事一项前沿研究项目。
3. 3.The company is investing in new technologies that will be at the frontline of innovation.
   该公司正在投资新技术，这些技术将成为创新的前沿。