Express mail is a fast postal service that guarantees quicker delivery of mail and packages compared to regular mail. It is typically used when urgent or time-sensitive items need to be sent. Express mail services offer tracking and often include a delivery guarantee, meaning the item will be delivered within a specific time frame, such as overnight or within a few days. This service is commonly used for documents, parcels, or packages that need to arrive quickly, and it often costs more than standard mailing options due to its speed.

英語での「express mail」の定義と意味

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