security vault

例句：

1. 1. The bank's security vault is the only place where they keep their most valuable documents.
   银行的保险柜是他们存放最宝贵文件的唯一地方。
2. 2. The thief managed to steal a large sum of money from the security vault before being caught.
   这名窃贼设法从保险柜中偷走了一大笔钱，但最终还是被抓获了。
3. 3. The vault was heavily guarded by armed guards during the night.
   在那个晚上，保险柜由武装警卫严密看守。