从内部机制看，在创建字符串时换行符会被忽略，在打印字符串时可以看出这一点。
Internally, the newline character is ignored when creating the string, as is shown when the string is printed.
点矩阵印字机：用点子依照矩阵形式而造成图文的印字机。
Matrix printer: printer that produces images formed from dots that conform to matrix unit.
点矩阵印字机：用点子依照矩阵形式而造成图文的印字机。
Matrix printer: printer that produces images formed from dots that conform to matrix unit.
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