
好词典

源自短语 'back up',由 'back'(后部)和 'up'(向上)组成,最早用于描述支持或补充的行为,后引申为数据备份等现代用法。
❶ 备份,指为预防数据丢失而额外保存的副本,或指在紧急情况下可用的替代方案或支持。
“Make sure you have a backup of your important files.”
(确保你对重要文件进行了备份。)
“The hospital has a backup generator in case of a power outage.”
(医院有一台备用发电机以防停电。)
❶ 备份或支持,指将数据复制到另一个地方以防丢失,或指为某人或某事提供支持。
“Don't forget to backup your computer files regularly.”
(别忘了定期备份你的电脑文件。)
“The police officer called for backup when the situation got out of control.”
(当情况失控时,警察呼叫了支援。)
backup plan — 备用计划,指在主计划失败时使用的替代方案。
“Always have a backup plan in case things don't go as expected.”
(总是准备一个备用计划以防事情不如预期发展。)
call for backup — 请求支援,通常用于紧急情况下需要额外帮助时。
“The officer called for backup when he saw the suspect had a weapon.”
(当警官看到嫌疑人有武器时,他呼叫了支援。)