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