Receiver is the event manager object for receiving events.
Receiver是事件管理者对象，用于接收事件。
Publisher is the event manager object for publishing events.
Publisher是事件管理者对象，用于发布事件。
To assist Manager in the planning, implementation and running of promotional events.
协助经理计划、组织和实施促销活动。
To assist Manager in the planning, implementation and running of promotional events.
协助经理计划、组织和实施促销活动。
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