名词
中文翻译：邮政系统
同义词：
['postal system', 'postal service', 'postal network']
例句：
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1. The post system is crucial for the delivery of mail and parcels.
邮政系统对于邮件和包裹的投递至关重要。
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2. The postal system has been undergoing reforms to improve efficiency.
邮政系统正在进行改革以提高效率。
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3. The postal system is responsible for delivering letters and packages across the country.
邮政系统负责在全国范围内运送信件和包裹。