外接备用设备

外的英语翻译：

besides; in addition; not closely related; other; outer; outside; unofficial
【医】 ec-; ecto-; exo-; extra-; xeno-

接的英语翻译：

receive; accept
【电】 connecting

备用设备的英语翻译：

【计】 off-premise; SB; stand-by; stand-by equipment; stand-by facility
standby equipment
【经】 off-stream unit