Two Time Creation 二度创作
The default header includes the filename and file creation date and time, along with a page number and two lines of blank footer.
默认的头部（header）包含文件名和文件创建日期和时间，以及一个页号和两行空白页脚。
The two nulls indicate that we do not want to change the last access time or creation time for this file.
这两个null指出，我们不想改变这一文件的最后访问时间或者创建时间。
It is impossible to separate seeing and creating clearly as two different concepts. But to see, and to continue to see, in course of time, becomes creation.
不能把观看和创作截然分开为两个完全不同的概念。
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