通常，这些字符在每行的行首或行末锚定模式。
Normally, those characters anchor the pattern at the beginning, or the end, of each line.
对于每一行，首先解压所有的空格和行末的换行符。
For each line, first extract all of the Spaces and the line feed at the end of the line.
版面每栏的头一行和末一行要对齐。
The top and bottom line of each column on the page should align.
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