名词
中文翻译：边界
同义词：
['margin', 'edge', 'margins']
例句：
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1. Theborder between China and India is very thin.
中国和印度之间的边界非常狭窄。
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2. Thecity's border with the countryside ismarked by a river.
这个城市与乡村的边界被一条河流所标记。
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3. Theborder patrols are responsible for maintaining orderalong the border.
边境巡逻队负责维护边境秩序。