backup aid

例句：

1. 1. The company's backup plan was to find a new supplier.
   该公司的备用计划是找到一个新的供应商。
2. 2. She backed up her argument with facts.
   她用事实来支持她的论点。
3. 3. The team worked together to back up the manager's decision.
   团队共同努力来支持经理的决定。