front line

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌfront ˈline noun  1  [countable usually singular]WAR the place where fighting happens in a war 〔战争中的〕前线，前方 SYN frontin/on the front line troops who had served in the front line at Magdeburg 曾在马格德堡前线驻扎的部队 three miles behind the front line 前线后方三英里2  in the front line a) NEWdoing something that has not been done before 在前沿，在最前线 in the front line of the fight against cancer 在抗癌斗争的前沿 b) BLAMElikely to be blamed for an organization’s mistakes 在首当其冲的位置；最易遭到责难的 —front-line adjective [only before noun] front-line troops 前线部队

Examples from the Corpus

front line• The entire front line, with few exceptions, went down in the consuming blast.• Or his practice of filming in the front line, and even beyond the front line?• So where is the front line in a war like that?• The camera eventually tracks away leaving the boy still shaking his boot, part of the furniture of the front line.• 68% of people approve of women fighting on the front lines.• Researchers concluded that the front line of HIV prevention had shifted to smaller cities.in/on the front line• He argued that these were the people on the front line.• They were sitting in the front line of chairs.• Then they started on the front line of police.• She is trapped in the front line on the killing streets of Western Sarajevo.• Not so much the opposition - what shook me up was to see children being used in the front line by protestors.

ˌfront ˈline nounChineseSyllable  

Corpus place fighting the happens where in

front line
ˌfront ˈline noun
1. [countable usually singular] the place where fighting happens in a war
   SYN  front
    in/on the front line
    troops who had served in the front line at Magdeburg
    three miles behind the front line
2. in the front line
  a. doing something that has not been done before:
    in the front line of the fight against cancer
  b. likely to be blamed for an organization’s mistakes
—ˈfront-line adjective [only before noun]:
    front-line troops