Replacing currency notes and coins is a very complex matter that needs careful planning if the exercise is to go well and not be disruptive to users . we in the hkma know this very well from experience 纸币及硬币的新旧交替是非常复杂的工作,必须事前缜密部署,才可使替换过程顺利完成,避免对大众造成不便。