Note that your function could not only read these values, but write them.

请注意，你的函数不仅可以读取这些值，但是写他们。

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We specifies that the function should try to open the file for read and write.

我们指定标志位来让打开的文件能够读和写。

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We specifies that the function should try to open the file for read and write.

我们指定标志位来让打开的文件能够读和写。

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