Mot-clefs : 即時通訊_________________，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通________________________，龍笛即時通_____________________，視頻會議___________________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)(fā)(fā)__________，手機(jī)端