相关单词近义词 fallback 撤退, reserve 保留, replacement 更换, resource 资源, stand-in 替身, backup 后备, substitute 代用品, spare 备用的, emergency 突发事件, unreserved 坦率的, last-minute 最后一刻的, late 迟的, understudy 充当（某角色的）候补演员...临近词standing, standards, standby UPS, standby mode, standby file, standby load, standby time, standby crew, standby code, standby unit, standby face, standby line 返回 stand-by