证件

In a sentence

• 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.

  Here, '证件' refers to official documents as proof of identity or authorization, such as an ID card or passport.

• 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.

  In this context, '证件' is specifically a student ID being used as a form of identification for a specific purpose.

• 警方要求嫌疑人提供身份证等证件。

  The police required the suspect to provide an ID card or other documentation.

  Here, '证件' is used to mean any formal identification document that validates personal identity.