每天，美国邮政平均处理4.934亿件邮件--从明信片到社保支票再到药品，无所不包。
Every day, USPS processes, on average, 493.4 million pieces of mail —anything from postcards to Social Security checks to medicine.
虽然很难辨别哪些包裹里装的是社会保障支票等重要物品，但美国邮政（USPS）和联合包裹服务公司（UPS）会尽其所能优先处理敏感材料。
It can be hard to identify which parcels are carrying crucial items such as Social Security checks, but USPS and UPS try their best to prioritize sensitive material.
美国邮政局平均每天处理4.934亿封邮件，从明信片到社保支票再到药品，无所不包。
Every day, USPS processes, on average, 493.4 million pieces of mail—anything from postcards to Social Security checks to medicine.
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