网友作文三：
　　Dear all:
　　The file system will shtudown [1]due to system maintainance next Friday.
　　It will take a full day to finish this job.[2]
　　Please do not acccess the [3]file server that day and backup your files one it[4].

名师修改意见：　　
[1]够干练了，语法错误多。 Be shut down
[2]去掉
[3]Access to
[4]On it?
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