the front line
noun[S]
uk/ˌfrʌnt ˈlaɪn/us/ˌfrʌnt ˈlaɪn/aplacewhereopposingarmiesfaceeach other inwarand wherefightinghappens
(战争)前线
Tens of thousands ofsoldiersdiedon thefrontline.数以万计的士兵在前线阵亡。
More front-linetroopswill beflownto thebattlezoneover the next fewdays.今后几天将会有更多的前线部队被调往交战区域。
Idiom
be in the front line