キーワード: 即時(shí)(shí)通訊___，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通______，龍笛即時(shí)(shí)通___________________，移動(dòng)辦公______________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)(fā)