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)