他们在花园周围竖起了白色的小木桩作为围栏。

They put up white wooden ___pickets around the garden as a fence.

两名哨兵在营地入口处站岗。

Two ___pickets were stationed at the entrance to the camp.

工人们在公司门口设立纠察线，阻止其他人进入。

The workers set up a ___picket at the company gate to prevent others from entering.