名词
中文翻译：边界
同义词：
['border', 'frontier', 'limit']
例句：
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1. The border between China and India is very important.
中国和印度之间的边界非常重要。
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2. The frontier region has always been a source of tension between the two countries.
这个边境地区一直是两国之间紧张的源头。
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3. The government decided to build a new border wall to prevent illegal immigration.
政府决定建造新的边境墙以防止非法移民。