添加这些行号只是为了能够方便地对代码进行引用。
They have been added only for the sake of making references to the code.
如果希望每次进入vi会话时都显示行号，那么在主目录中的. exrc文件中添加set number行。
If you want to display line Numbers every time you enter a vi session, add the line set number to the.exrc file in your home directory.
绝对引用设计时，要在公式中单元格的列号或者行号前面添加$符号，可以添加一个，也可以添加两个。
An absolute reference is designated in the formula by the addition of a dollar sign ($) . It can precede the column reference, the row reference, or both.
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