名词
中文翻译：自由边界
同义词：
['free zone', 'unbounded boundary']
例句：
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1.The free boundary between the two countries is a source of tension.
两国之间的自由边界是紧张的根源。
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2. The researcher found that the free boundary between the two cultures was causing confusion.
研究者发现，两种文化之间的自由边界导致了混淆。
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3. The free boundary between nature and technology is a topic of debate in today's society.
自然与技术之间的自由边界是当今社会的一个辩论话题。