名词
中文翻译：线边界
同义词：
['border', 'boundary line']
例句：
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1. The line boundary between the two countries is clear.
两国之间的界限非常清晰。
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2. The construction workers were working on the line boundary.
建筑工人正在施工，位于边界上。
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3. The line boundary is a critical issue for the development of the region.
边界线是该地区发展的关键问题。