名词
中文翻译：Unknown
同义词：
['slavery', 'serfdom', 'feudalism']
例句：
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1.The helotomia system was abolished in the 19th century.
奴隶制在19世纪被废除。
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2.The helotomia system was abolished in the 19th century.
奴隶制在19世纪被废除。
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3.The helotomia system was abolished in the 19th century.
奴隶制在19世纪被废除。