名词
中文翻译：Unknown
同义词：
['limit', 'line', 'demarcation']
例句：
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1.The boundary between the two countries is clearlymarked.
两国之间的边界非常清晰。
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2. The boundaryof the park is well-maintained.
公园的边界维护得很好。
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3. The boundaryof knowledge is expanding all the time.
知识边界在不断扩展。