A more thorough explanation:

The Bureau of Customs is an agency responsible for regulating and enforcing laws related to the import and export of goods in a country. In the United States, the Bureau of Customs is also known as the United States Customs Service.

For example, if a company wants to import goods into the United States, they must go through the Bureau of Customs to ensure that the goods meet all necessary regulations and that any taxes or duties are paid.

Another example is when an individual travels internationally and brings back souvenirs or other items. They must declare these items to the Bureau of Customs and may be required to pay taxes or duties on them.

These examples illustrate how the Bureau of Customs plays an important role in regulating the flow of goods and ensuring that all necessary laws and regulations are followed.