backup

• 名词，指备用的人或物、后备力量，也指数据或文件的副本。

A noun referring to a reserve, duplicate, or support system, such as a copy of data, a substitute person, or an accumulation causing a blockage.

1. Accumulation due to blockageB2informal

   A buildup or pile-up caused by a clog or stoppage, often in a system or flow.

   堵塞

   • There was a backup in the sink because of the clogged drain.
   • The traffic backup stretched for miles after the accident.
   • A backup in the sewer system caused flooding in the basement.

   同义词blockageclogcongestionjamlogjamobstructionsnarl

2. Replacement or substituteB1formal

   A person who takes over the role of another, especially in dangerous or difficult situations.

   替补

   • The team has a backup in case the lead singer gets sick.
   • He served as a backup for the security guard during the night shift.
   • We need a backup driver for the long road trip.

   同义词alternatecoverreliefreplacementreservestand-insubstitutesurrogateunderstudy

3. Supporting musical partB2formalart

   A vocal or instrumental part that provides support or background for the main musical performance.

   伴奏

   • The backup singers harmonized beautifully with the lead vocalist.
   • He played backup guitar for the band during the concert.
   • The backup track added depth to the song's arrangement.

   同义词accompanimentsupport

4. Digital copyB1formalIT

   A copy of a file or directory stored on a separate device to prevent data loss.

   备份

   • Always keep a backup of your important documents on an external hard drive.
   • The system automatically creates a backup every night.
   • She lost her data because she didn't have a backup.

   同义词archivecopyduplicatemirror

5. Approval and supportB2formal

   The act of providing endorsement, assistance, or reinforcement to someone or something.

   支持

   • The manager gave his backup to the new project proposal.
   • She needed backup from her colleagues to push the idea forward.
   • The committee offered its backup for the community initiative.

   同义词aidapprovalassistanceblessingendorsementpatronagereinforcementsponsorshipsupport