physical device number

例句：

1. 1.The company uses a physical device number to track the location of its servers.
   该公司使用物理设备编号来追踪其服务器的位置。
2. 2.This physical device number is unique to each individual's account.
   这个物理设备编号是每个个体账户的唯一标识。
3. 3. To ensure security, the physical device number must be changed regularly.
   为了确保安全，必须定期更换物理设备编号。