the front line
剑桥词典
- a place where opposing armies face each other in war and where fighting happens
（战争）前线
Tens of thousands of soldiers died on the front line . 数以万计的士兵在前线阵亡。
More front-line troops will be flown to the battle zone over the next few days . 今后几天将会有更多的前线部队被调往交战区域。