根据区域边界内的植物数量，北极地区可以划分成三个植物区系(分别是高北极，低北极和次北极)。
The Arctic region is broken into three floristic zones (High, Low and Sub Arctic), referring to the amount of plant life that exists within the regions' boundaries.
移除位于指定区域边界内的墨迹。
Removes the ink that is within the bounds of the specified area.
使用具有定位能力的无线通信装置来标记虚拟操作区域的边界且使用其标记所述边界内的一个或一个以上障碍。
A wireless communications device with positioning capabilities is used to mark a boundary of a virtual operations area, and used to mark one or more obstacles within the boundary.
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