名词
中文翻译：内边界
同义词：
['inner boundary', 'inner limit例句：1. The inner-boundary of the oil zone is crucial for oil exploration.（油区的内边界对于石油勘探至关重要。）2. The inner-boundary between the two countries has been a point of contention for years.（两国之间的内边界多年来一直是争议的焦点。）']
例句：
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1. The inner-boundary of the oil zone is crucial for oil exploration.
油区的内边界对于石油勘探至关重要。
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2. The inner-boundary between the two countries has been a point of contention for years.
两国之间的内边界多年来一直是争议的焦点。
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3. The inner-boundary of the forest was not visible from the road.
森林的内边界从路上是看不到的。