I’ve got my mother as a backup in case the babysitter cancels.
They realized that Sykes was armed, and radioed for backup.
a backup generator/crew
Remember to do regular backups.
a backup copy
Her sister goes on tour with her and sings backup.
a backup vocalist
a backup in traffic
a backup of sewage into a building
英语词典包含67175条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。