picket

例句：

1. 1. 抗议；2. 守卫；3. 阻止；4.
   在栅栏或篱笆上
2. 1. The protesters gatheredoutside the government building to picket against the new policy.
   抗议者聚集在政府大楼外抗议新政策。
3. 2. The soldiers were ordered to barricade the entrance to the city to prevent intruders.
   士兵们被命令把入口封锁起来防止入侵者。
4. 3. The police officers stood by their posts at the crossroads, ready to intervene if needed.
   警察站在十字路口的岗位上，随时准备介入。