doublelock

例句：

1. 1. The security guard double-checked the door before letting anyone in.
   保安在让任何人进入之前，先检查了门是否双重锁好。
2. 2. He double-checked his work to make sure it was perfect.
   他反复检查工作以确保完美无缺。
3. 3. She double-checked her passport and phone numbers before leaving the house.
   她离开家前，仔细核对了她的护照和电话号码。