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昨天有一名警察在执行公务时受伤。
A policeman was injured in the line of duty yesterday.
《牛津词典》
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他因妨碍警察执行公务而被逮捕。
He was arrested for obstruction of a police officer in the execution of his duty.
《牛津词典》
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他们被指控妨碍警察执行公务。
They were charged with obstructing the police in the course of their duty.
《牛津词典》