"Passport" and "Customs Declaration Form" are the common English terms for what might be referred to as a "通关单" in Chinese. However, if you're specifically referring to a document that allows passage through checkpoints or borders, it might be more accurately termed a "Clearance Permit" or "Passage Permit."

Below is an example of how such a document might be described in English:

Clearance Permit

A Clearance Permit is an official document issued by the relevant authorities which allows the bearer to pass through designated checkpoints or border crossings. This document may be required for various reasons, such as international travel, cargo transport, or specific activities within a restricted area.

The permit typically includes information such as the name of the holder, the purpose of the journey, the duration of the stay, and sometimes a list of items being carried. It serves as proof that the holder has met all necessary requirements and has been authorized to enter or exit a particular jurisdiction.

Please let me know if you need a more specific context or additional details!