For anyone unfamiliar with free and open source version control systems ( VCSs ), Subversion has become the standard non-commercial VCS, replacing the old champ, Concurrent Versions System ( CVS ). 对于任何不熟悉免费的开源版本控制系统(VCS)的人来说,Subversion开始成为一种标准的非商业性质的VCS,取代了旧的并发版本系统(CVS)(ConcurrentVersionsSystem,CVS)。