noun🔗Share备份，后备。 A reserve or substitute."If the goalkeeper is injured, we have a backup."如果守门员受伤了，我们有后备人选。technologycomputingbusinesssystemtechnicalChat with AIVocabulary GamePractice Reading
noun🔗Share备份，后备副本 A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged."After the power failure, we had to restore the database from backup."停电后，我们不得不从备份中恢复数据库。computingtechnologysystembusinessChat with AIVocabulary GamePractice Reading
noun🔗Share堵塞，拥堵. An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow."The accident caused a mile-long backup on the highway."那场事故导致高速公路上堵塞了一英里。materialenvironmentdisastertechnicalindustryChat with AIVocabulary GamePractice Reading
noun🔗Share支援，后援。 (law enforcement) reinforcements"The police officer called for backups when the crowd became unruly. "当人群开始骚动时，警察呼叫了支援。policelawChat with AIVocabulary GamePractice Reading
