名词
中文翻译：边界
同义词：
['limit', 'line', 'demarcation']
例句：
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1. The boundary between the two countries isclear.
两国之间的边界非常清晰。
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2. The boundaryof the park is marked with a fence.
公园的边界被一道围栏标出。
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3.The boundary between different cultures is often complex.
不同文化之间的边界往往很复杂。