对邮递区号进行同样的操作。

Do the same for the shipping postal code.

我可以在电话簿上找到邮递区号。

I can find the zip code in the phone book.

征收的话会导致州际商业出现混乱，因为美国有8000多个不同的销售税辖区，它们都经常改变规定、甚至使用不同的邮递区号。

It would lead to chaos in interstate commerce, since America has some 8,000 different sales-tax jurisdictions that are constantly changing their rules and are not even aligned with zip codes.