the front lineBrE/ðə ˌfrʌnt ˈlaɪn/NAmE/ðə ˌfrʌnt ˈlaɪn/noun[sing.]anareawheretheenemiesarefacingeachotherduringawarandwherefightingtakesplace前线◆Tankshavebeendeployedallalongthefrontline. 整个前线全都部署了坦克。◆front-linetroops前线部队●inthefrontline (ofsth)doingworkthatwillhaveanimportanteffectonsth在最重要的岗位上;在第一线◆alifespentinthefrontlineofresearch在研究的第一线度过的一生