Subversion：防止对一个文件的本地修改被提交？

I have a Subversion working copy where I made some local modifications to one file. The modifications are only relevant to me, I do not want to commit them. (The version in the repository contains some default values which are suitable for the other users, just not for me, which is why I want to override them locally.)I have a Subversion working copy where I made s