This is the 7547th most frequent Chinese word.
证件
Certificate; credential; document.
Here, '证件' refers to official documents as proof of identity or authorization, such as an ID card or passport.
我在办理签证时需要出示有效证件。
I need to present valid identification documents when applying for a visa.
In this context, '证件' is specifically a student ID being used as a form of identification for a specific purpose.
图书馆借书需要使用学生证作为证件。
A student ID is required as identification to borrow books from the library.
Here, '证件' is used to mean any formal identification document that validates personal identity.