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)