名词短语
中文翻译：认证邮件同义词
同义词：
['certified', 'registered', 'authorized', 'official', 'certified', 'registered', 'authorized', 'official']
例句：
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1. I need to send a certified letter to my friend in Beijing.
我需要寄一封经过认证的信给我在北京的朋友。
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2. The package was sent with certified mail to ensure it arrives safely.
这个包裹是用认证邮件寄出的，以确保它能安全到达。
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3. The sender included a certification of authenticity on the envelope.
发件人在信封上附有真实性证明。