名词
中文翻译：一等邮件
同义词：
['first class', 'first-rate mail例句：1. We sent our package in first-class mail to ensure it arrived safely.（我们用一等邮件发送了我们的包裹，以确保它能安全到达。）']
例句：
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1. We sent our package in first-class mail to ensure it arrived safely.
我们用一等邮件发送了我们的包裹，以确保它能安全到达。
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2. The post office offers a variety of services for first-class mail.
邮局为一等邮件提供了多种服务。
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3.She carefully packed her clothes in first-class mail to avoid damage during transit.
她仔细地将衣服打包在一等邮件中，以避免运输过程中的损坏。