名词
中文翻译：铁路邮件服务
同义词：
['railway postal service', 'railway mail delivery']
例句：
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1. The railway mail service is very reliable and efficient.
铁路邮件服务非常可靠且高效。
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2. They use the railway mail service to send their packages overseas.
他们使用铁路邮件服务将包裹寄往海外。
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3.The railway mail service has been greatly improved in recent years.
近年来，铁路邮件服务得到了极大的改善。