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on (the, an) average<-->on foot
on duty 值日,值班 He reported the murder to the police on duty. 他将凶杀事件告知值班警察。 I go on duty at 8:00 am. 我早晨8点钟上班。 Who is on duty today? 今天谁值日? Please bleep the doctor on duty immediately. 请立刻用传呼机召值班医生。 I arrive at the hospital at eight o'clock, but I don't go on duty until nine. 我八点钟就到医院了,但是九点钟我才去值班。 The rule is that someone must be on duty at all times. 按照规定,任何时候均需有人值班。
on (the, an) average<-->on foot
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