read-only       
adjective  computing specialized uk/ˌriːdˈəʊn.li/ us/ˌriːdˈoʊn.li/
 (电脑文件等)只能读(不能修改)的
used to refer to computer files or memory that can be read or used, but not changed or added to in any way
  For a file to be marked "read-only" there has to be a good reason to protect it. 要将一个文件标记为 "只读",必须有一个需要保护的好理由来这么做。 
 Read-only memory cannot be erased or altered. 只读存储器不能被删除或更改。 
 See also: ROM
 - More examples
 - She had found read-only files and wanted to overwrite them.
 - There's a read-only view that lets users view, but not change, a document.
 - You're currently viewing as a guest, which gives you limited read-only access.