n.支持，后援；阻塞；备份文件；[乐]伴奏adj.备用的，后补的；支持性的；伴奏的； 变形： 复数：backups 英英释义： backup[ 'bækʌp ]n.an accumulation caused by clogging or a stoppage"a traffic backup on the main street"; "he discovered a backup in the toilet"someone who takes the place of another (as when