英语翻译USPS First Class Mail Intl / First Class Package Intl Se

I want to send this package by first class mail.中的first clas USPS的First-Class Mail从美国到中国广州大概需要多长的时间呢? 什么是priority mail和express mail和first-class mail first-class first-class, second-class 英语翻译All notices should be mailed via first class mail with p 美国邮政first class mail到国内的时间? first-class reading是什么意思 什么是first class lever first-class honour是什么意思 first class functions是什么意思 Welder (First Class)