名词
中文翻译：扇形边界
同义词：
['sectoral boundary', 'sectoral boundary']
例句：
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1. The company's sector boundary is defined by the river that separates its northern and southern regions.
该公司的扇形边界是由河流定义的，这条河流将公司的北部和南部地区分隔开来。
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2. The government has established a sector boundary to regulate the flow of goods across the border.
政府已经设立了一个扇形边界来监管货物穿越边境的流量。
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3. The new policy aims to maintain a sector boundary between the two countries to prevent illegal trade.
新政策旨在保持两国之间的扇形边界，以防止非法贸易。