当你要配置管理工具客户端撤销对一个文件做的变更时，那些变更也就丢失了。
When you tell your SCM client to undo the changes you have made to a file, those changes will be lost.
为了常规事务管理的目的，配置管理工具通常在客户端保留了一点特殊的信息。
For housekeeping purposes, the SCM tool usually keeps a bit of extra information on the client side.
为了保持所有文件的当前状态信息，配置管理工具客户端必须不舍昼夜的关注所有发生的事情。
In order to keep all this file status information current, the SCM client must have ways of staying up to date with everything that is happening.
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