从上面到达单元格相当于将左面的字符从S2加入S2 '，跳过上面的S1中的当前字符，并在S1 '中加入一个空格。

Coming at the cell from above is the same as adding the character at the left from S2 to S2 ', while skipping the character in S1 above for now and introducing a space in S1 '.

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您可以用命令locale charmap查询当前语言环境中字符编码的名称。

You can query the name of the character encoding in your current locale with the command locale charmap.

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例如，字符类[：punct：]表示当前语言环境中的所有标点字符。

For instance, the character class [: punct:] stands for all punctuation characters in the current locale.

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