| 单词 | fourth-class |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔fourth-class〕As or by fourth-class mail.作为第四类邮件的美国传统〔special handling〕The handling of fourth-class or parcel-post mail as first-class mail for an extra charge.快速处理投递：将四级邮件或包裹邮件作为一级邮件处理并收取额外费用的投递美国传统 |
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