名词
中文翻译：公国
同义词：
['duchy', 'dukedom', 'principality']
例句：
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1. The duchy of Savoy is one of the most important in Europe.
萨伏依公爵领地是欧洲最重要的之一。
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2. The duchy was once a major economic center of the region.
这个公国曾是该地区的主要经济中心。
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3. The duchy has been struggling with financial difficulties for years.
这个公国多年来一直面临着财政困难。