handover
英 [ˈhændəʊvə(r)] 美 [ˈhændoʊvər]
n. (权力、责任等的)移交，移交期; (某人或某物的)交出，上交
牛津词典
noun
（权力、责任等的）移交，移交期
the act of moving power or responsibility from one person or group to another; the period during which this is donethe smooth handover of power from a military to a civilian government
从军政府到文人政府的权力的顺利移交
（某人或某物的）交出，上交
the act of giving a person or thing to sb in authoritythe handover of the hostages
人质的交出