例如，保安人员巡逻在教学楼和学生宿舍的校园，并执行严格的入口把关，禁止任何人进入拿枪或刀。

For example, security guards should patrol on campus around teaching buildings and student dorms, and enforce strict entrance checks, barring entry to anyone carrying a gun or a knife.

youdao

保安的嘴巴锋利如刀。

The guard's mouth is like a knife.

youdao

保安的嘴巴锋利如刀。

The guard's mouth is like a knife.

youdao