キーワード: 即時(shí)(shí)(shí)通訊____________________，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通_________________，龍笛即時(shí)(shí)(shí)通_________，移動(dòng)(dòng)辦公_________，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)(fā)