be on duty◇值勤交通警 policeman on point duty; 值勤人员 personnel on duty不值勤: off-hour; offhourr值勤, 公务: line of duty值勤;职责: duty值勤班: on duty值勤泵: duty pump; service pump; sewage broad irrigation pump下载手机词典可随时随地查词查翻译