名词
中文翻译：边界
同义词：
['border', 'line', 'demarcation']
例句：
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1. The city's boundaries are markedby the river.
这座城市的边界被河流所标出。
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2. The line of demarcation between two countries is clear.
两国之间的分界线是清晰的。
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3. Theborder between China and Indiais a long and complex one.
中国和印度之间的边界长且复杂。