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