学个词Learn a Word 第724期 In the line of duty

（单词翻译）

今天我们要学的词是in the line of duty。 In the line of duty意思是在执行公务的时候。"North Carolina firefighters honored their comrades who were killed in the line of duty last year," 北卡罗来纳州的消防队员悼念了去年在灭火时以身殉职的战友们。

这个星期是美国的警察周。"Hundreds of law officers from across the country arrived in Washington by bicycle to honor those who died in the line of duty," 数以百计的警察从全美各地骑自行车来到首都华盛顿，悼念那些在值勤中以身殉职的警察。好的，今天我们学习的词是in the line of duty...