Perl5 リファレンス

       import  There is no builtin `import' function.  It is just
               an ordinary method (subroutine) defined (or
               inherited) by modules that wish to export names to
               another module.  The `use' function calls the
               `import' method for the package used.  See also
               the use() entry elsewhere in this document, the
               perlmod manpage, and the Exporter manpage.