the front line
剑桥词典
- a place where opposing armies face each other in war and where fighting happens
（戰爭）前線
Tens of thousands of soldiers died on the front line . 數以萬計的士兵在前線陣亡。
More front-line troops will be flown to the battle zone over the next few days . 今後幾天將會有更多的前線部隊被調往交戰區域。