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1.The sector marker is used to mark the boundaries of each sector on a map.
扇区标记器用于在地图上标记每个扇区的边界。
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2. The sector marker was designed to help us identify the different areas in the city.
扇区标记器的设计是为了帮助我们识别城市中的不同区域。
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3.The sector marker was used to measure the distance between two points on the map.
扇区标记器被用来测量地图上两点之间的距离。