A version tag applies a meaningful name of your choice to a specific revision of each file in the repository, essentially creating a named snapshot of your development project.
版本标记将一个有意义的名称应用于存储库中每个文件的一个特定修订版本，这实际上创建开发项目的一个命名快照。
When a change is committed, a new revision is created for the file.
当提交了变更之后，就会创建此文件的一个新的修订。
Revision control systems attempt to address the problem posed by developers trying to alter a file simultaneously, preventing users from overwriting each others' alterations.
版本控制系统试图解决开发人员在试图同时对某个文件进行修改时所出现的冲突问题，可以防止用户覆盖其他人所作的修改。
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