1、首先，给出一个句子a：
a="The eagle flies in the vast sky,the fish swim in the clear water,and all things are in the light of autumn to live a free life.";
2、对字符串强制换行：
InsertLinebreaks[a,36]
3、按照空格，把句子分解为单词：
b=StringSplit[a]
4、在单词的左面填充0，使得每个单词的长度为20：
c=StringPadLeft[b,20,"0"];
5、在右侧填充单词：
d=StringPadRight[b,20,"^o._"];
6、用“___”把单词两两连接，并换行：
StringRiffle[Partition[b,2] ,"\n","___"]
