名词
中文翻译：定期邮件
同义词：
['regular post', 'regular mail', 'regular delivery']
例句：
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1. We use regular mail to send our packages overseas.
我们使用定期邮件将包裹寄往海外。
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2. The post office provides regular mail services for residents in the area.
邮局为该地区居民提供定期邮递服务。
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3. Regular mail is often slower than express delivery.
定期邮递通常比快递慢。