一种数据访问类型，它允许数据被读出，但不允许数据被复制、打印或修改。

A type of access to data that allows it to be read but not copied, printed, or modified.

youdao

一种数据访问类型，它允许数据被读出，但不允许数据被复制、打印或修改。

A type of access to data that allows it to be read but not copied, printed, or modified.

youdao