English to Chinese Social Sciences International Org/Dev/Coop

原文是：in the event of a time difference, participation can be in the form of a sequenced written or podcast contribution。这句话是讲一个组织的成员如何参与该组织的活动。这里的sequenced written是什么？podcast 是视频点播的意思吗？请假大家，谢谢各位！