frame relay unit中继: relay; repeating; relaying; ...单元: unit; unit element; cell; lo ...光中继单元: oru optical repeater unit模拟中继单元: ath:analogue trunk unit再生中继单元: rru regenerative repeater unit下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:帧中继单元，即可在微信中查询翻译
