守备

例句：

1. 1. The soldiers were ordered to maintaina strict watch on the border.
   士兵们被命令在边境维持严密的警戒。
2. 2. Thepolice are conducting a thorough investigation intothe incident.
   警方正在对这起事件进行彻底的调查。
3. 3. The company is committed tomaintaining its high standards of quality and service.
   该公司致力于保持其高质量和服务的高标凈。