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...
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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。
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