Understanding Postal Systems in the United States: USPS, UPS, and FedEx

在美國，常見的郵政服務主要由USPS、UPS和FedEx構成。每種運輸管道都有獨特的價格計算方式。無論是寄送信件和包裹，了解這些郵政系統可以幫助自己郵寄體驗更加順暢。

In the United States, postal services are primarily handled by USPS, UPS, and FedEx. Each service offers distinct advantages and pricing structures depending on your shipping needs. Whether you're sending letters, packages, or need specialized services like express delivery or international shipping, understanding these options can streamline your shipping experience.