名词
中文翻译：二等邮件
同义词：
['second-class mail', 'second-class postal service']
例句：
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1. We needto send our package by first class mail to ensure it arrives on time.
我们需要通过一等邮件发送我们的包裹，以确保它能按时到达。
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2. The post office offers a variety of services for those who prefer second class mail.
邮局为那些喜欢二等邮件服务的人提供了多种服务。
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3. She decided to send her letter in the mailbox rather than using second class mail.
她决定把信放在邮箱里，而不是用二等邮件寄出。