The United States Post Office is a government organization, like most countries, and it is a very large organization.

与大多数国家一样， 美国邮局是一个政府机构，而且是一个非常庞大的机构。

The head of the United States Post Office said that the magazine could not be delivered to people's homes because it broke the laws against obscenity.

美国邮局负责人表示，该杂志不能送到人们家中，因为它违反了禁止淫秽物品的法律。