We arm ourselves, we set perimeters, we stand guard.
我们武装自己, 我们设置警戒线, 我们站岗放哨。
Most of the perimeters of the border crossing points are neither fenced nor secured by access gates.
大多数过境点的周界既没有围墙, 也没有控制进入的大门。
The areas and perimeters of these quartz grains were calculated by GISbased technologies.
并计算出每颗石英的周长和面积。
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