名词
中文翻译：关税同盟
同义词：
['customs union', 'customs alliance', 'customs association']
例句：
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1. The European Union is a customs union of 28 countries.
欧盟是一个由28个国家组成的关税同盟。
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2. The tariff union has been working on a new trade agreement.
关税同盟一直在努力制定新的贸易协定。
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3. Tariff unions are often used to protect domestic industries from foreign competition.
关税同盟通常被用来保护国内产业免受外国竞争的影响。