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1. The postal service is responsible for delivering mail and packages.
邮政服务负责运送邮件和包裹。
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2. The postal system is designed to ensure the safe delivery of mail.
邮政系统旨在确保邮件的安全送达。
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3. The postal worker received a package from her friend in another city.
邮政工作人员收到了她朋友从另一个城市寄来的包裹。