1.(in war)前线；火线
a massive concentration of soldiers on the front line前线士兵的大规模集结
2.(in any situation)最突出的因素；最显眼的因素
3.in the front line
(important)处于第一线；发挥重要作用
Allen will be in the front line as the company faces some of its toughest challenges.公司在面临一些最严峻的挑战时, 艾伦会冲在最前面。
hard-nosed jobs where you're always in the front line你总是在其中起关键作用的那些难以搞定的工作
Information officers are in the front line of putting across government policies.新闻官员处于传达政府政策的第一线。