I have no idea about how tuition waiver works. Could you elaborate on that?我对减免学费没有概念。你能否详加说明？ He spelled out the government's plans in his speech.他在演说中把政府的计划详加说明。A spokesman declined to elaborate on a statement released late yesterday.发言人拒绝对昨天晚些时候发表的声明详加说明。