...d a letter from mary who has trouble making friends » 您收到了从玛丽有麻烦结交朋友的信 if you made changes » 如果已更改 ..
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如果已更改，则更新将被拒绝，并通知用户已经发生居间更新。
If it has, the change will be rejected and the user notified that there has been an intervening update.
如果文件已更改，那么它将文件复制到目标目录。
If the file has changed, it copies it to the target directory.
如果您想要改变已命名查询自身的话，它能使您避免更改所有的参考。
It keeps you from having to change all references to a query if you happen to change the named query itself.
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