Not surprisingly, younger troops, 18-to 24-year-olds, who often draw the deadliest front line duty, are the most at risk.

而18至24岁之间的年轻军人，由于经常被分配担任最致命的前线任务，难怪他们也是最高危险的族群。

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More than 3,000 police officers were wounded in the line of duty last year.

去年三千多名警官在执行任务时受伤。

《柯林斯英汉双解大词典》

A policeman was injured in the line of duty yesterday.

昨天有一名警察在执行公务时受伤。

《牛津词典》

Mr.Ban said he offers his deepest condolences to the colleagues who fell in the line of duty for noble causes and to their families and friends.

VOA: standard.2009.10.05

Its men manage to draw up a rota for front-line duty and joint operations.

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The army, in particular, is overstretched, and the navy is being forced to reduce the battle-readiness of some ships to concentrate men and equipment in those on front-line duty.

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And all Americans are grateful for the lives that they gave in the line of duty.

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