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vi.协防，补防；支持；堵塞；复制往后退； 英英释义： back up n.an accumulation caused by clogging or a stoppage同义词：backupsomeone who takes the place of another (as when things get dangerous or difficult)同义词：stand-insubstitutereliefrelieverbackupbackup manfill-ina subordinate mus
