The rewind function "rewinds" the position of the file pointer to the beginning of the file.

函数的作用是：将文件指针的位置倒回到文件的开头。

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This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.

整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。

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This function moves the file pointer from its current position to a new position, forward or backward, specified by the number of bytes.

整个函数将文件指针从当前位置向前或向后移动移动到一个新的位置。

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