名词
中文翻译：关税区
同义词：
['tariff line', 'customs boundary', 'trade barrier']
例句：
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1. The tariff zoner is a crucial factor in determining the trade relationship between countries.
关税区划是决定国家之间贸易关系的关键因素。
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2. The tariff zoner has been a topic of discussion among economists and policymakers.
关税区划一直是经济学家和政策制定者讨论的话题。
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3. The tariff zoner is designed to protect domestic industries while allowing for free trade.
关税区划旨在保护国内产业的同时，允许自由贸易。