backups/ˈbæk.ʌp/名词后备人员；候补物，替代物，备用物He's a backup for the Dallas Cowboys.他是达拉斯牛仔队的替补队员。/ˈbæk.ʌp/形容词伴奏的；伴唱的backup vocals伴唱想跟读，去练习
